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When a form is submitted to a PHP script, the information from
that form is automatically made available to the script. There
are many ways to access this information, for example:
Example 12-8. A simple HTML form <form action="foo.php" method="post">
Name: <input type="text" name="username" /><br />
Email: <input type="text" name="email" /><br />
<input type="submit" name="submit" value="Submit me!" />
</form> |
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Depending on your particular setup and personal preferences, there
are many ways to access data from your HTML forms. Some examples are:
Example 12-9. Accessing data from a simple POST HTML form <?php
// Available since PHP 4.1.0
echo $_POST['username'];
echo $_REQUEST['username'];
import_request_variables('p', 'p_');
echo $p_username;
// Available since PHP 3. As of PHP 5.0.0, these long predefined
// variables can be disabled with the register_long_arrays directive.
echo $HTTP_POST_VARS['username'];
// Available if the PHP directive register_globals = on. As of
// PHP 4.2.0 the default value of register_globals = off.
// Using/relying on this method is not preferred.
echo $username;
?> |
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Using a GET form is similar except you'll use the appropriate
GET predefined variable instead. GET also applies to the
QUERY_STRING (the information after the '?' in a URL). So,
for example, http://www.example.com/test.php?id=3
contains GET data which is accessible with $_GET['id'].
See also $_REQUEST and
import_request_variables().
As shown, before PHP 4.2.0 the default value for register_globals
was on. And, in PHP 3 it was always on. The PHP
community is encouraging all to not rely on this directive
as it's preferred to assume it's off and code
accordingly.
PHP also understands arrays in the context of form variables
(see the related faq). You may,
for example, group related variables together, or use this
feature to retrieve values from a multiple select input. For
example, let's post a form to itself and upon submission display
the data:
Example 12-10. More complex form variables |
<?php
if (isset($_POST['action']) && $_POST['action'] == 'submitted') {
echo '<pre>';
print_r($_POST);
echo '<a href="'. $_SERVER['PHP_SELF'] .'">Please try again</a>';
echo '</pre>';
} else {
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
Name: <input type="text" name="personal[name]" /><br />
Email: <input type="text" name="personal[email]" /><br />
Beer: <br />
<select multiple name="beer[]">
<option value="warthog">Warthog</option>
<option value="guinness">Guinness</option>
<option value="stuttgarter">Stuttgarter Schwabenbräu</option>
</select><br />
<input type="hidden" name="action" value="submitted" />
<input type="submit" name="submit" value="submit me!" />
</form>
<?php
}
?>
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In PHP 3, the array form variable usage is limited to
single-dimensional arrays. As of PHP 4, no such restriction applies.
When submitting a form, it is possible to use an image instead
of the standard submit button with a tag like:
When the user clicks somewhere on the image, the accompanying
form will be transmitted to the server with two additional
variables, sub_x and sub_y. These contain the coordinates of the
user click within the image. The experienced may note that the
actual variable names sent by the browser contains a period
rather than an underscore, but PHP converts the period to an
underscore automatically.
PHP transparently supports HTTP cookies as defined by Netscape's Spec. Cookies are a
mechanism for storing data in the remote browser and thus
tracking or identifying return users. You can set cookies using
the setcookie() function. Cookies are part of
the HTTP header, so the SetCookie function must be called before
any output is sent to the browser. This is the same restriction
as for the header() function. Cookie data
is then available in the appropriate cookie data arrays, such
as $_COOKIE, $HTTP_COOKIE_VARS
as well as in $_REQUEST. See the
setcookie() manual page for more details and
examples.
If you wish to assign multiple values to a single cookie variable, you
may assign it as an array. For example:
That will create two separate cookies although MyCookie will now
be a single array in your script. If you want to set just one cookie
with multiple values, consider using serialize() or
explode() on the value first.
Note that a cookie will replace a previous cookie by the same
name in your browser unless the path or domain is different. So,
for a shopping cart application you may want to keep a counter
and pass this along. i.e.
Example 12-11. A setcookie() example |
<?php
if (isset($_COOKIE['count'])) {
$count = $_COOKIE['count'] + 1;
} else {
$count = 1;
}
setcookie('count', $count, time()+3600);
setcookie("Cart[$count]", $item, time()+3600);
?>
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Typically, PHP does not alter the names of variables when they
are passed into a script. However, it should be noted that the
dot (period, full stop) is not a valid character in a PHP
variable name. For the reason, look at it:
Now, what the parser sees is a variable named
$varname, followed by the string concatenation
operator, followed by the barestring (i.e. unquoted string which
doesn't match any known key or reserved words) 'ext'. Obviously,
this doesn't have the intended result.
For this reason, it is important to note that PHP will
automatically replace any dots in incoming variable names with
underscores.
Because PHP determines the types of variables and converts them
(generally) as needed, it is not always obvious what type a given
variable is at any one time. PHP includes several functions
which find out what type a variable is, such as:
gettype(), is_array(),
is_float(), is_int(),
is_object(), and
is_string(). See also the chapter on
Types.
User Contributed Notes
Variables from outside PHP
krydprz at iit dot edu
03-May-2005 03:14
This post is with regards to handling forms that have more than one submit button.
Suppose we have an HTML form with a submit button specified like this:
<input type="submit" value="Delete" name="action_button">
Normally the 'value' attribute of the HTML 'input' tag (in this case "Delete") that creates the submit button can be accessed in PHP after post like this:
<?
$_POST['action_button'];
?>
We of course use the 'name' of the button as an index into the $_POST array.
This works fine, except when we want to pass more information with the click of this particular button.
Imagine a scenario where you're dealing with user management in some administrative interface. You are presented with a list of user names queried from a database and wish to add a "Delete" and "Modify" button next to each of the names in the list. Naturally the 'value' of our buttons in the HTML form that we want to display will be "Delete" and "Modify" since that's what we want to appear on the buttons' faceplates.
Both buttons (Modify and Delete) will be named "action_button" since that's what we want to index the $_POST array with. In other words, the 'name' of the buttons along cannot carry any uniquely identifying information if we want to process them systematically after submit. Since these buttons will exist for every user in the list, we need some further way to distinguish them, so that we know for which user one of the buttons has been pressed.
Using arrays is the way to go. Assuming that we know the unique numerical identifier of each user, such as their primary key from the database, and we DON'T wish to protect that number from the public, we can make the 'action_button' into an array and use the user's unique numerical identifier as a key in this array.
Our HTML code to display the buttons will become:
<input type="submit" value="Delete" name="action_button[0000000002]">
<input type="submit" value="Modify" name="action_button[0000000002]">
The 0000000002 is of course the unique numerical identifier for this particular user.
Then when we handle this form in PHP we need to do the following to extract both the 'value' of the button ("Delete" or "Modify") and the unique numerical identifier of the user we wish to affect (0000000002 in this case). The following will print either "Modify" or "Delete", as well as the unique number of the user:
<?
$submitted_array = array_keys($_POST['action_button']);
echo ($_POST['action_button'][$submitted_array[0]] . " " . $submitted_array[0]);
?>
$submitted_array[0] carries the 0000000002.
When we index that into the $_POST['action_button'], like we did above, we will extract the string that was used as 'value' in the HTML code 'input' tag that created this button.
If we wish to protect the unique numerical identifier, we must use some other uniquely identifying attribute of each user. Possibly that attribute should be encrypted when output into the form for greater security.
Enjoy!
user: "someuser" at mai1server "ua.fm"
02-May-2005 02:17
Numerous string like:
if (isset($_POST["var1"]))
$var1=$_POST["var1"];
else $var1='';
...
if (isset($_POST["varN"]))
$varN=$_POST["varN"];
else $varN='';
Can be replaced with:
get_superglobal_vars_from_POST('var1',...,'varN');
function get_superglobal_vars_from_POST()
{
$numargs = func_num_args();
$setargs = 0; // for counting set variables
for ($i=0; $i<$numargs; $i++)
{
$varname=func_get_arg($i);
if (!isset($_POST[$varname]))
$result='';
else
{
$result=$_POST[$varname];
$setargs++;
}
$GLOBALS["$varname"]=$result;
}
return $setargs; // who cares?
}
tim at timpauly dot com
30-Apr-2005 08:57
This code module can be added to every form using require_once().
It will process any and all form data, prepending each variable with
a unique identifier (so you know which method was used to get the data).
My coding could be neater, but this sure makes processing forms much easier!
<?php
session_start(); $ArrayList = array("_POST", "_GET", "_SESSION", "_COOKIE", "_SERVER"); foreach($ArrayList as $gblArray) {
$prefx = strtolower(substr($gblArray,1,3))."_"; $tmpArray = $$gblArray;
$keys = array_keys($tmpArray); foreach($keys as $key) {
$arcnt = count($tmpArray[$key]);
if ($arcnt > 1) {
$lcount = 0;
foreach ($tmpArray[$key] as $dval)
{
$prkey = $prefx.$key; $prdata['$prkey'] = $dval; ${$prkey}[$lcount] = $prdata['$prkey']; $lcount++;
}
} else { $prkey = $prefx.$key; $prdata['$prkey'] = $tmpArray[$key]; $$prkey = $prdata['$prkey']; }
}
}
?>
tmk-php at infeline dot org
08-Apr-2005 11:38
To handle forms with or without [] you can do something like this:
function repairPost($data) {
// combine rawpost and $_POST ($data) to rebuild broken arrays in $_POST
$rawpost = "&".file_get_contents("php://input");
while(list($key,$value)= each($data)) {
$pos = preg_match_all("/&".$key."=([^&]*)/i",$rawpost, $regs, PREG_PATTERN_ORDER);
if((!is_array($value)) && ($pos > 1)) {
$qform[$key] = array();
for($i = 0; $i < $pos; $i++) {
$qform[$key][$i] = urldecode($regs[1][$i]);
}
} else {
$qform[$key] = $value;
}
}
return $qform;
}
// --- MAIN
$_POST = repairPost($_POST);
The function will check every field in the $_POST with the raw post data and rebuild the arrays that got lost.
agup at cpr dot org
15-Mar-2005 07:43
If you have multiple checkboxes that you want to submit from an html form to process elsewhere, you might try using this methodology:
1) create a unique id number for each row in the table
2) assign that unique row id to each checkbox input name
3) pass the total number of rows as a hidden value in the form
4) recover all the checkbox booleans by iterating through all the unique settings.
5) on the downstream page you can assign any value you want to the variable before writing it to the database or whatever you need to do. For example; you can assign the value 0 if the boolean for the checkbox is FALSE.
row=0;
do{
<form name="some_name" action="some_action.php" method="post">
<td><input type="checkbox" name="unique_item[<?echo$row?>]">
<INPUT TYPE="hidden" name="row_count" value="<?echo$row?>"></INPUT>
<INPUT TYPE="submit" name="....">
.
.
row++;
}
while (something);
</table>
</form>
Upon submit, all the unique checkbox booleans can then be recovered on another PHP page using:
$some_data = $_POST['some_data'];
$row_count = $_POST['row_count'];
$row=0;
do {
if($some_data[$row]){
...do something...e.g. assign a variable, write to db, etc.
}
if(!$some_data[$row]){
...do something...e.g. assign a variable, write to db, etc.
}
$row++;
}
while ($row<$row_count);
I left out alot of syntax since this example is simply illustrative to cover multiple scenarios. Don't forget to always validate form data before entering it into a database. I hope this helps.
Murat TASARSU
02-Mar-2005 06:29
if you want your multiple select returned variable in comma seperated form you can use this. hope that helps. regards...
$myvariable
Array ( [0] => one [1] => two [2] => three )
turns into
one,two,three
<?php
$myvariable="";
$myseperator="";
foreach ( $_POST["myvariable"] as $v) {
if (!isset($nofirstcomma)) $nofirstcomma=0; else $myseperator=",";
$myvariable = $myvariable.$myseperator.$v;
}
echo $myvariable;
?>
jlratwil at yahoo dot com
01-Feb-2005 07:35
To get multiple selected (with "multiple" ) lists in <select> tag, make sure that the "name" attribute is added to braces, like this:
<select multiple="multiple" name="users[]">
<option value="foo">Foo</option>
<option value="bar">Bar</option>
</select>
When submitted to PHP file (assume that you have a complete form) it will return an array of strings. Otherwise, it will just return the last element of the <select> tag you selected.
__kbanks at (__ignoreunderscores) dot gmail dot com
17-Jan-2005 05:05
Hi all:
I'm presently building a solution to programmatically build, view, and validate HTML forms when I came across the ol' PHP non-scalar form variable handling problem. Because my form validator class would really have no way of knowing if a given form variable was meant to be scalar or not, I decided to TREAT ALL PHP FORM VARIABLES AS ARRAYS, i.e., to use the '[]' syntax for all variables, scalar or not. This way, the form designer need not remember to specify the '[]' syntax, and the Form->HTML transformer need not scan for every input within the form, looking for duplicate names. This also eliminates the risk of losing data you meant to keep in an array but to which you forgot to apply the '[]' syntax.
You may then either treat all form variables as arrays in your form handling code, or you may, as I intend to do, filter each HTML request through a Front Controller (desc. in Fowler, PoEAA). The Front Controller would convert all arrays of length 1 to a scalar variable and leave multi-element arrays as they are. This should essentially convert PHP's handling of non-scalar form variables to that of ASP's (or slightly better, since multiple form values of the same name will actually be arrays, not just comma-seperated values).
This way my Form Validator class can just check if the input to validate is an array, and then apply some constraint across each element in the array.
dreptack at op dot pl
02-Jan-2005 02:33
I needed to post html form through image input element. But my problem was I had to use multiple image-buttons, each one for a single row of form table. Pressing the button was mention to tell script to delete this row from table and also (in the same request) save other data from the form table.
I wrote simple test-script to see what variable I should check for in a script:
I have a html document:
<form action="test.php" method="post">
<input type="image" name="varscalar" src="/images/no.gif" />
<input type="image" name="vararray[12]" src="/images/no.gif" />
</form>
And a php script:
<?php
if ($_POST) {
echo "post: <pre>"; print_r($_POST); echo '</pre>';
}
?>
What I've discovered suprised me a lot.
After hitting on varscalar:
post:
Array
(
[varscalar_x] => 6
[varscalar_y] => 7
)
After hitting on upper right corner of vararray:
post:
Array
(
[vararray] => Array
(
[12] => 2
)
)
This mean when clicking on image-type input element, which name is an array, only y-part of a value is remembered.
The result is the same on: php 4.1.2 on Win98se, php 4.3.9-1 on linux
mattij at nitro fi no at no dot no
05-Nov-2004 09:39
If you try to refer or pass HTML-form data which has arrays with javascript remember that you should point to that array like this
<script type="text/javascript">
window.opener.document.forms[0]["to[where][we][point]"];
</script>
pascal dot poncet at netconsult dot com
28-Oct-2004 10:33
Concerning the use of both javascript and php in working with forms :
In a php code, it's quiet easy and practical to use names like "fieldname[]" in checkbox input type html elements. You will then retrieve the value(s) transmitted in the "fieldname" array type variable.
But a difficulty appears in coding some javascript function able to manipulate those fields values to verify them, as "fieldname[]" must not be recognize directly as an array in the script.
Here is a nice way to solve this question :
(html code)
<form method="post" action="..." onsubmit="return verifyForm(this)">
<input type="checkbox" name="colors[]" value="black"> black<br>
<input type="checkbox" name="colors[]" value="white"> white<br>
<input type="checkbox" name="colors[]" value="other"> other color<br>
</form>
(javascript code)
function verifyForm(form) {
var selColors=new String();
for(i=0;i<form["colors[]"].length;i++)
if(form["colors[]"][i].checked) selColors+=form["colors[]"][i].value;
if(selColors=="") msgErr="You have to check at least one choice of color";
...
}
Of course, you may also verify anything else about the checked values, like the value itself, only by using 'form["colors[]"][i].value' instead of '...checked'.
Happy to help you,
Pascal
PS : apologying for my bad english.
任侠(hsh_crack at tom dot com)
03-Aug-2004 02:12
a simple example:
<?
if(!isset($_POST["username"]))
{
?>
<form action=<? echo $_SERVER['PHP_SELF'] ?> method="post">
姓名:<input type="text" name="username"><br>
电子邮件:<input type="text" name="email"><br>
<input type="submit" name="submit" value="提交">
</form>
<?
}
else{echo $_POST["username"];} ?>
lennynyktyk at yahoo dot com
09-Jul-2004 04:42
When dealing with multiple select boxes and the name=some_name[] so that PHP will understand that is needs to interpet the input as an array an not as a single value. If you want to access this in Javascript you should assign an id attribute to the select box as well as the name attribute. Then proceed to use the id attribute in Javascript to reference the select box and the name attribute to reference the select box in PHP.
Example
<select multiple id="select_id" name="select_name[]">
....
</select>
<?PHP
echo $select_name[0];
?>
<script language="javascript">
document.forms[0].select_id.options[0].selected = true;
</script>
I hope you get the idea
arjini at mac dot com
27-Mar-2004 01:48
When dealing with form inputs named_like_this[5] and javascript, instead of trying to get PHP to do something fancy as mentioned below, just try this on the javascript side of things:
<form name="myForm">
<script>
my_fancy_input_name = 'array_of_things[1]';
/* now just refer to it like this in the dom tree
document[myForm][my_fancy_input_name].value
etc*/
</script>
<input type="text" name="array_of_things[1]" value="1"/>
</form>
No fancy PHP, in fact, you shouldn't need to change your PHP at all.
jan.gacioch at motorola dot com
19-Feb-2004 01:52
Just a correction regarding 'cscotti@ifrance' contribution: code '$first = $item_value;' should be place just BEFORE the 'else if' condition and NOT AFTER.
So correct code would be:
function multi_post_item() {
$array_output = array();
$raw_input_items = split("&", $_SERVER["QUERY_STRING"]);
foreach ($raw_input_items as $input_item) {
// split this item into name/value pair
$item = split("=", $input_item);
// form item name
$item_name = urldecode($item[0]);
// form item value
$item_value = urldecode($item[1]);
if ( !isset($array_output[$item_name]) ) {
$array_output[$item_name] = $item_value;
$first = $item_value;
} elseif ( !is_array($array_output[$item_name]) ) {
$array_output[$item_name] = array();
$array_output[$item_name][]= $first;
$array_output[$item_name][]= $item_value;
} else {
$array_output[$item_name][]= $item_value;
}
}
return $array_output;
}
epr3
11-Feb-2004 03:40
there is more simple to generate the checkbox and recognize
which box is clicked
<?php
echo '<script language="JavaScript" type="text/JavaScript">
var t = 0;
</script>';
for($i = 0 ;$i <5 ;$i++){
echo '
<script language="JavaScript" type="text/JavaScript">
t++;
document.writeln(t);
document.writeln("<input type=\"checkbox\" name=\"cbx_foo[]\" value=\"" + t + "\">");
</script>
';
}
foreach($_POST['cbx_foo'] as $value) {
echo "<BR>You clicked checkbox number " . $value . "\n";
}
?>
jim at jamesdavis dot it
22-Jan-2004 01:59
How to pass a numerically indexed array.
This is the part inside the form. Notice that the name is not 'english[$r]' which you would normally write, but 'english[]'. PHP adds the index when it receives the post and it starts at 0.
<?php
for ($r=0; $r <= count($english)-1; $r++){
echo "<TEXTAREA NAME='english[]'>".$english[$r]."</TEXTAREA>";
}
?>
<?php
And this will get it out at the other end
function retrieve_english(){
for ($r=0; $r <= count($_POST['english'])-1; $r++){
echo $_POST['english'][$r]."<BR>";
}
}
?>
Keys are useful but so are numerical indices!
Cheers everyone
darren at sullivan dot net
01-Dec-2003 10:37
This function is a simple solution for getting the array of selectes from a checkbox list or a dropdown list out of the Querry String. I took an example posted earlier and simplified it.
function multi_post_item($repeatedString) {
// Gets the specified array of multiple selects and/or
// checkboxes from the Query String
$ArrayOfItems = array();
$raw_input_items = split("&", $_SERVER["QUERY_STRING"]);
foreach ($raw_input_items as $input_item) {
$itemPair = split("=", $input_item);
if ($itemPair[0] == $repeatedString) {
$ArrayOfItems[] = $itemPair[1];
}
}
return $ArrayOfItems;
}
Use the name of the field as the agrument. Example:
$Order = $_GET['Order'];
$Name = $_GET['Name'];
$States = multi_post_item('States');
$Products = multi_post_item('Products');
Be sure to check for NULL if there are no selections or boxes checked.
06-Nov-2003 11:07
It's been driving me mad, but I've finally worked out the only way to reliably allow form data to be fed back into a form (for editing a record, for instance) is like this:
echo "<input type='text' name='varname' ";
if(isset($existingvalue))
echo "value=\"".htmlspecialchars(stripslashes($existingvalue))."\" ";
echo "/>";
This assumes that variables have been escaped (such as addslashes) after being retrieved from the database or after being received from a (probably this) form.
Note the type of quotes used in the code above: the value attribute must use escaped double-quotes, and the echo command must use double-quotes, or errors occur when single quotes appear in the data. htmlspecialchars will protect the form from errors caused by data that contains double quote marks, and it stops errors occurring when triangle brackets < > are present in the data.
Alas, to make your site display properly, you must also use htmlspecialchars every time string data is displayed to the user.
There might be an easier way of allowing data to safely be put back into a form, but if there is, I've spent a lot of time not finding it.
soeren at hattel dot dk
06-Nov-2003 06:07
The decision in PHP to translate a query string like:
a=2&a=3&a=4
into one single variable a=4 is simply strupid!
The "wonderful" hack allowing multiple values to be read only if one uses:
a[]=2&a[]=3&a[]=4
is - at first sight - a nice feature but soon become a pain in the a..!
In ASP and ASPX the first situation is handled as:
a=2,3,4
which is better than the PHP behaviour but still bad (what if your variable values contain commas?).
It seems to me that the proper behaviour would be:
a=2&a=3&a=4
automatically generates an array with all the variables inside. I know this would require proper error handling but evevy things does anyway!
kevinrlat nospam dot ccs dot neu dot edu
07-Aug-2003 12:47
if you use an array of checkboxes to submit info to a database or what have you, be careful of the case when no boxes are checked. for example:
<form method="post">
<input type="checkbox" name="checkstuff[]" value="0">
<input type="checkbox" name="checkstuff[]" value="1">
<input type="checkbox" name="checkstuff[]" value="2">
. . .
</form>
if these are submitted and none are checked, the $_POST['checkstuff'] variable will not contain an empty array, but a NULL value. this bothered me when trying to implode() the values of my checkboxes to insert into a database, i got a warning saying the 2nd argument was the wrong type.
hope this helps!
-kevin
nospam at thenerdshow dot calm
12-Jul-2003 05:04
I've combined the method of converting old code suggested by solar at heliacal dot net into the improved script below. This one works whether the submit is get or post and, as in my previous contribution, sets any unsubmitted variables to null, preventing errors. This supercedes my previous post below (if it hasn't been deleted yet).
$expected=array(
'name', // Only accept these variables from a submit!
'email',
'favorite_color'
); foreach ($expected as $formvar)
$$formvar = (isset(${"_$_SERVER[REQUEST_METHOD]"}[$formvar]))?
${"_$_SERVER[REQUEST_METHOD]"}[$formvar]:NULL;
nospam at thenerdshow dot calm
09-Jul-2003 07:57
you can convert old code to work with register_globals=off without sacrificing security. Or maybe you like working with variables the old way better. I know I do!
I looked all over for something like this so here it is:
$expected=array(
'name', // Only accept these variables from a submit!
'email',
'favorite_color'
); for ($i=0;$i < count($expected);$i++)
$$expected[$i] = (isset($_GET[$expected[$i]]))?$_GET[$expected[$i]]:NULL;
// This is a test.
echo "Name: $name<br>";
echo "Email: $email<br>";
echo "Fav. Color: $favorite_color<br>";
cscotti@ifrance
09-Jul-2003 06:53
In reply to the second post:
This function construct an HTTP vars array
It is useful for javascript/dom incompatibility with form_input_item[] names for checkboxes, multiple selects, etc.
function multi_post_item() {
$array_output = array();
$raw_input_items = split("&", $_SERVER["QUERY_STRING"]);
foreach ($raw_input_items as $input_item) {
// split this item into name/value pair
$item = split("=", $input_item);
// form item name
$item_name = urldecode($item[0]);
// form item value
$item_value = urldecode($item[1]);
if (!isset($array_output[$item_name]) ) {
$array_output[$item_name] = $item_value;
}else if (!is_array($array_output[$item_name])){
$first = $item_value;
$array_output[$item_name] = array();
$array_output[$item_name][]= $first;
$array_output[$item_name][]= $item_value;
}else{
$array_output[$item_name][]= $item_value;
}
}
return $array_output;
}
mraymer at universal-solutions dot net
28-May-2003 07:37
A further thought about the checkbox without check mentioned above. Rather than writing in a HIDDEN element. Why not have your validation code check for the variable of the checkbox like so:
Assume HTML form has the following unchecked checkbox:
<INPUT TYPE='CHECKBOX' NAME="CATEGORY[]">Category Name</INPUT>
then your ACTION script in the form points to a script which has:
if (!isset($checkbox))
{
CATEGORY[] = "off";
}
If you were dynamically creating the checkboxs, then, most likely, you would have your hands on the keys for each CATEGORY and you could create something like:
while (list($cat_id,$cat_title) = each($categories))
{
if (isset($category))
{
if (!$category[$cat_id])
{
$category[$cat_id] = "off";
}
else
{
$category[$cat_id] = "on";
}
}
else
{
$category[$cat_id] = "off";
}
}
Assuming that you have an array named $categories constructed with unique keys and category titles.
un shift at yahoo dot com
01-Apr-2003 12:07
This function takes a recurring form item from php://input and loads it into an array - useful for javascript/dom incompatibility with form_input_item[] names for checkboxes, multiple selects, etc. The fread maxes out at 100k on this one. I guess a more portable option would be pulling in ini_get('post_max_size') and converting it to an integer.
function multi_post_item($input_item_name) {
$array_output = array();
$in_handle = fopen("php://input", "r");
$raw_input_items = split("&", urldecode(fread($in_handle, 100000)));
foreach ($raw_input_items as $input_item) {
// split this item into name/value pair
$item = split("=", $input_item);
// form item name
$item_name = $item[0];
// form item value
$item_value = $item[1];
if ($item_name == $input_item_name) {
$array_output[] = $item_value;
}
}
return $array_output;
}
vb at bertola dot eu dot org
19-Mar-2003 11:38
For what I understand, since PHP 4.3 it is possible to access the content of a POST request (or other methods as well) as an input stream named php://input, example:
readfile("php://input");
[to display it]
or
$fp = fopen("php://input", "r");
[to open it and then do whatever you want]
This is very useful to access the content of POST requests which actually have a content (and not just variable-value couples, which appear in $_POST).
This substitutes the old $HTTP_RAW_POST_DATA variable available in some of the previous 4.x versions. It is available for other upload methods different from POST too, but it is not available for POSTs with multipart/form-data content type, since the file upload handler has already taken care of the content in that case.
mail at paulodeon dot com
12-Mar-2003 07:42
If you have form data that could be coming in via either GET or POST and register_globals is off (as it should be) use the empty() function to find out where the data is coming from, as in the following example
if(empty($_GET)) {
$clientfilter = $_POST['clientfilter'];
$branchfilter = $_POST['branchfilter'];
}
if(empty($_POST)) {
$clientfilter = $_GET['clientfilter'];
$branchfilter = $_GET['branchfilter'];
}
Big thank you to all the people posting helpful comments on these boards, I dont know what i'd do without you. <a href="www.paulodeon.com">www.paulodeon.com</a>
04-Mar-2003 09:21
"...the dot (period, full stop) is not a valid character in a PHP variable name."
That's not completely correct, consider this example:
$GLOBALS['foo.bar'] = 'baz';
echo ${'foo.bar'};
This will output baz as expected.
keli at kmdsz dot ro
03-Feb-2003 09:37
image type inputs apparently return their "value" argument from Mozilla, but not from IEXplorer... :(
example:
<input type="image" name="sb" value="first" src="first.jpg">
using a mozilla will give you
$sb="first" AND $sb_x, $sb_y ... whereas from IE there's just no $sb. :(
[this in short form, as I'm still using trackvars :) ]
philip at cornado dot com
09-Oct-2002 12:58
One method to mimick register_globals being on at runtime is:
if (!ini_get('register_globals')) {
$types_to_register = array('GET','POST','COOKIE','SESSION','SERVER');
foreach ($types_to_register as $type) {
if (@count(${'HTTP_' . $type . '_VARS'}) > 0) {
extract(${'HTTP_' . $type . '_VARS'}, EXTR_OVERWRITE);
}
}
}
It's not recommended to do this, just rewrite your scripts instead, it's not hard.
steiner277 at charter dot net
09-Jul-2002 07:55
When accessing variables from a post, do NOT put $_POST['fieldname'] in double quotes or you will get an error message.
e.g. the following works fine:
$msg = "The message is:\t" . $_POST['message'] . "\n";
but the following will cause errors:
$msg = "The message is:\t$_POST['message']\n";
hjncom at hjncom dot net
25-May-2002 05:34
jesper at codecrew dot dk
11-May-2002 09:12
Just to help others with the same stupid problem i have:
I you use a checkbox in your form, it will only return the value specified in value if it is checked.
ex. <input type="checkbox" value="yes">
in php code you then write
$checkboxchecked = ($checkbox == "yes");
I guess :)
a at b dot c dot de
03-Feb-2002 06:49
As far as whether or not "[]" in name attributes goes, The HTML4.01 specification only requires that it be a case-insensitive CDATA token, which can quite happily include "[]". Leading and trailing whitespace may be trimmed and shouldn't be used.
It is the id= attribute which is restricted, to a case-sensitive NAME token (not to be confused with a name= attribute).
carl_steinhilber at NOSPAMmentor dot com
30-Jan-2002 04:19
A group of identically-named checkbox form elements returning an array is a pretty standard feature of HTML forms. It would seem that, if the only way to get it to work is a non-HTML-standard-compliant workaround, it's a problem with PHP.
Since the array is passed in the header in a post, or the URL in a get, it's the PHP interpretation of those values that's failing.
yasuo_ohgaki at hotmail dot com
11-Mar-2001 06:02
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