PHP array_count_values() – Counting the Frequency of Values in an Array

The PHP function array_count_values() returns an associative array where each key is a value from the input array and each value is the number of times that key appears.

It takes a single parameter $input, which is the array to be analyzed. The function returns an array mapping each distinct value to its count. Non‑string and non‑integer elements trigger an E_WARNING.

Example:

<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

The output of the example is:

Array
(
    [1] => 2
    [hello] => 2
    [world] => 1
)