To get an array from a form POST into PHP, you have to name the form variable with square brackets:
<html>
<body>
<pre>
<?php var_export( $_POST ); ?>
</pre>
<form action="" method="post">
<label> 4<input type="checkbox" name="cats[]" value="4"></label>
<label> 5<input type="checkbox" name="cats[]" value="5"></label>
<label> 6<input type="checkbox" name="cats[]" value="6"></label>
<input type="submit" value="Submit">
</body>
</html>
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