(PHP 4, PHP 5, PHP 7) Return the current element in an array

(PHP 4, PHP 5, PHP 7) Fetch a key from an array

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Computes the intersection of arrays with additional index check

(PHP 5 >= 5.5.0, PHP 7) Return the values from a single column in the input array

(PHP 5 >= 5.1.0, PHP 7) Computes the difference of arrays using a callback function on the keys for comparison

(PHP 4, PHP 5, PHP 7) Return all the values of an array

(PHP 4, PHP 5, PHP 7) Return an array with elements in reverse order

(PHP 4, PHP 5, PHP 7) Sort an array with a user-defined comparison function and maintain index association

(PHP 5 >= 5.2.0, PHP 7) Fill an array with values, specifying keys

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Computes the difference of arrays with additional index check