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

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

(PHP 4, PHP 5, PHP 7) Shift an element off the beginning of array

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

(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) Sort an array bool sort

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

(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) Count all elements in an array, or something in an object