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<?php $a = array(A, Cat, Dog, A, Dog);

print_r(array_count_values($a));

?>

Array ( [A] => 2 [Cat] => 1 [Dog] => 2 )

Array ( [A] => 2 [Cat] => 2 [Dog] => 1 )

Array ( [A] => 1 [Cat] => 1 [Dog] => 2 )

Array ( [A] => 2 [Cat] => 1 [Dog] => 1)

A.

Array ( [A] => 2 [Cat] => 1 [Dog] => 2 )

The array_count_values() function counts all the values of an array.