Checkbox validation

@JavajoobJul 04.2007

Do you know how to validate checkboxes in PHP so that the user can only tick a limited number?

to post a comment

@bluestarsJul 04.2007 — #

[code=php]<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html><head>
 <title>PHP Test</title>
 <link rel="stylesheet" type="text/css" href="/main.css">
 <link rel="shortcut icon" href="/favicon.ico">
 </head><body>
 <?php
 if(isset($_POST) && count($_POST)) {
 $count = 0;
 foreach($_POST as $key => $value) {
 if($value == "on")
 $count++;
 }
 echo "<p>$count</p>";
 }
 else {
 ?>
 <form method="post">
 <input type="checkbox" name="cb1" /><br>
 <input type="checkbox" name="cb2" /><br>
 <input type="checkbox" name="cb3" /><br>
 <input type="submit" />
 </form>
 
 <?php
 }
 ?>
 
 </body></html>[/code]

That'll work as long as "on" isn't a valid response to one of your other form elements.

@JavajoobauthorJul 04.2007 — #Ah thanks and the $count bit is how much you limit it two?

@bluestarsJul 04.2007 — #All my code does is count it for you. After that, you could put an if statement comparing $count to your value, then kick it back to the user if it was greater.

You have any programming experience?

@JavajoobauthorJul 04.2007 — #I tried this in Javascript but then I realised that it can be bypassed so I thought I should do it in PHP

Checkbox validation

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