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Re: test if $_POST variable is set [message #175834 is a reply to message #175831]

Sat, 29 October 2011 13:09

Denis McMahon
Messages: 634
Registered: September 2010

Karma:

Senior Member

On Fri, 28 Oct 2011 22:40:31 -0700, cerr wrote:

> I have a form with various checkboxes, they got names i have from a db
> to identify them.
> Now I would like to check what has been posted by the form. For that I
> would like to read all the field names from the db and check if they
> have been set something like this:
>
> $result = mysql_query("SELECT * FROM specialty"); while($row =
> mysql_fetch_array($result)) {
> if (isset($_POST[$row['name']])) {
> var_dump($POST);
> session_unset();
> }
>
> But this doesn't seem to work the way I expected it to? I.e. I would
> liek to check if $_POST['MyCheckbox'] is set now but MyCheckbox is a
> name from the database. How do I do this best, the easiest way?

A checkbox name element is only defined (set) in the $_POST array if it
is checked when the form is submitted. The value of the element will be
"on" unless a value is defined for the form element, in which case that
value will be used.

So if you want an unchecked box to have a value in $_POST, you have to
give it one yourself:

<?php
print_r($_POST);
// set values in $_POST for checkboxes
// if checked, set $_POST[checkbox] = true
// if not checked, set $_POST[checkbox] = false
$result = mysql_query("SELECT * FROM specialty");

while($row = mysql_fetch_array($result)) if (!isset($_POST[$row
['name']])) $_POST[$row['name']] = 0;

print_r($_POST);
?>

Rgds

Denis McMahon

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[Message index]

		test if $_POST variable is set By: cerr on Sat, 29 October 2011 05:40
		Re: test if $_POST variable is set By: The Natural Philosoph on Sat, 29 October 2011 08:38
		Re: test if $_POST variable is set By: Richard Damon on Sat, 29 October 2011 13:04
		Re: test if $_POST variable is set By: Denis McMahon on Sat, 29 October 2011 13:16
		Re: test if $_POST variable is set By: Denis McMahon on Sat, 29 October 2011 13:09
		Re: test if $_POST variable is set By: Jerry Stuckle on Sat, 29 October 2011 13:26
		Re: test if $_POST variable is set By: cerr on Sat, 29 October 2011 18:39

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