Helpful PHP array functions

Just when you think you know PHP. You find these helpful array function.

in_array() http://au2.php.net/in_array

array_key_exists() http://au.php.net/array_key_exists

http://au.php.net/manual/en/ref.array.php

$value = array( [0] => 6 [1] => 5 [2] => 4 );
$k = 4;
 
$checked = false;
if(is_array($value))
{ 
    if(in_array($k, $value))
    {
        $checked = true;
    }
    else
    {
        $checked = false;   
    }
}