Starting to learn why no-one around here likes PHP...

These similar php functions have params in THE EXACT OPPOSITE ORDER.

    bool array_key_exists ( mixed $key , array $search )
    http://au2.php.net/array_key_exists

    bool property_exists ( mixed $class , string $property )
    http://au2.php.net/property_exists

Stick THAT up your PAAMAYIM NEKUDOTAYIM. (Or "double colon" in phpspeak/Hebrew...)

Fremnet contributed some more examples:

    http://au2.php.net/strpos
    http://au2.php.net/in_array

    http://au.php.net/array_map
    http://au2.php.net/array_filter