array array_count_values
array_count_values() returns an array using the values of the input array as keys and their frequency in input as values.
Example 1. array_count_values() example
1 2 $array = array(1, "hello", 1, "world", "hello"); 3 array_count_values($array); // returns array(1=>2, "hello"=>2, "world"=>1) 4
Note: This function was added in PHP 4.0.