array_count_values

array array_count_values(array values) 

Counts the occurrences of all elements in the argument and returns an associative array of the resulting frequencies.

Returns:

Associative array; NULL if given an invalid argument

Description:

Passing an array to array_count_values() returns an associative array in which all the unique elements are counted and returned with the values as the keys and the frequencies as the values.

Version:

PHP 4 since 4.0b4

Example:

Display the number of times a given element occurs in an array

$scores = array('A', 'A', 'C', 'B', 'A', 'C', 'C', 'B', 'A'); 
$grades = array_count_values($scores); 
echo "There were $grades[A] A's, $grades[B] B's, and $grades[C] C's"; 

Output: 
There were 4 A's, 2 B's, and 3 C's