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<?php $array = array(1, "hello", 1, "world", "1"); print_r(array_count_values($array)); ?>
Output for 4.3.0 - 4.4.9, 5.0.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [1] => 3 [hello] => 1 [world] => 1 )
Output for 5.0.0 - 5.0.1
Array ( [1] => 2 [hello] => 1 [world] => 1 [1] => 1 )