(PHP 4, PHP 5, PHP 7) Return all the keys or a subset of the keys of an array

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

(PHP 4, PHP 5, PHP 7) Prepend one or more elements to the beginning of 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) Sort an array bool sort

(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