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

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Removes duplicate values from an array

(PHP 4, PHP 5, PHP 7) Return the current key and value pair from an array and advance the array cursor

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

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

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

(PHP 4 >= 4.0.5, PHP 5, PHP 7) Searches the array for a given value and returns the corresponding key if

(PHP 4, PHP 5, PHP 7) Count all elements in an array, or something in an object