gotcha: automatically creates an array from name tag shenanigans

formMagic.php

<form method="post" action="form.php">
<input name="person[male][first_name]" value="john" />
<input name="person[male][last_name]" value="smith" />
<input name="person[female][first_name]" value="jane" />
<input name="person[female][last_name]" value="jones" />
<input type="submit" value="Submit">
</form>

<?php 
    echo "output : \n";
    var_dump($_POST);    

/*
output :  
array (size=1)
    'person' =>
        array (size=2)
            'male' =>
                array (size=2)
                    'first_name' => string 'john' (length=4)
                    'last_name' => string 'smith' (length=5)
            'female' =>
                array (size=2)
                    'first_name' => string 'jane' (length=4)
                    'last_name' => string 'jones' (length=5)
*/
?>