array array_count_values(array input);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 $array = array(1,"hello",1,"world","hello");
array_count_values($array); // returns array(1=>2, "hello"=>2, "world"=>1)
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Note: This function was added in PHP 4.0.