I remember that there were function that have such functionality. Unfortunately, I don't remember the name of it. Basically, it did something like...
$values = foo(array('x', 'y', 'z'), $_POST);
If there are such keys in the array, it does return new array (named $values) with only those keys... taken from $_POST. If one or more keys aren't in $_POST, it simply returns false.
Anyone remember something like that or I was just dreaming? Thanks in advice!
I think the function you are looking for is array_intersect_key() As of PHP 5.1.0.
array array_intersect_key ( array $array1 , array $array2 [, array $ ... ] )
Parameters
array1 - The array with master keys to check.
array2 - An array to compare keys against.
array - A variable list of arrays to compare.
Returns an associative array containing all the entries of array1 which have keys that are present in all arguments.
check out this function array_key_exists
<?php
$search_array = array('first' => 1, 'second' => 4);
if (array_key_exists('first', $search_array))
{
echo "The 'first' element is in the array";
}
?>
