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What is the correct using php to see if a checkbox is checked or not.

jayhawker

By jayhawker
in PHP Coding Help

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Psycho Prolific Member

Psycho

Posted
Posted 

if (isset($_POST['checkbox'])) {

 

If the value for the checkbox is checkbox then the above code would check to make sure it's set before going forward.

 

You mean to say if the "NAME" of the checkbox is "checkbox". . .

 

The isset() function doesn't care what the value is - as long as the variable has been initiated (it could even have a NULL value).

Skewled Member

Skewled

Posted
Posted 

if (isset($_POST['checkbox'])) {

 

If the value for the checkbox is checkbox then the above code would check to make sure it's set before going forward.

 

You mean to say if the "NAME" of the checkbox is "checkbox". . .

 

The isset() function doesn't care what the value is - as long as the variable has been initiated (it could even have a NULL value).

 

Yes I did mean to say that opps!  :P

DJTim666 Regular Member

DJTim666

Posted
Posted

A checkbox field is only passed IF the checkbox is checked. So, the isset() status would be the appropriate method to determine if the checkbox was checked or not.

 

A checkbox field will be passed to PHP regardless of user input. The appropriate method would be to compare the value of the passed checkbox to the values you're expecting. Otherwise just check if it's empty or not with empty().

Psycho Prolific Member

Psycho

Posted
Posted

A checkbox field will be passed to PHP regardless of user input.

That is incorrect. An unchecked checkbox field will not even exist in the POST data.

 

If you don't believe me, run this test page:

<html>
<body>
<form method="post">
Check/uncheck the checkbox and submit to see what is sent in POST data:
<input type="checkbox" name="foo" value="bar" /><br />
<button type="submit">Submit</button>
</form>
<br /><br />
Post Data:<br />
<pre>
<?php print_r($_POST); ?>
</pre>
</body>
</html>

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