Blog post support for simple validation using PHP's array_intersect_keys

array_intersect_keys.php

<?php
/* Check for presence of multiple keys in PHP using array_intersect_key
 * @param $a : array of data to be checked
 * @param $required : array of keys required
 * @datamafia // -- Marc
*/

// array to validate
$a = array(
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => 'value3',
);

// required keys for validation
$required = array('key1'=>null, 'key2'=>null);

// returns an array of intersections (matches)
$res = array_intersect_key($required, $a);

// validate the intersection with the required keys
if(count($res) != count($required)){
    echo 'FAIL';
}else{
    echo 'PASS';
}

echo "\r\n";