3v4l.org

run code in 500+ PHP versions simultaneously
<?php $array = ['a', 'b', 'c', 'c', 'c', 'd', 'a', 'b', 'b', 'b', 'b']; $counts = array_count_values($array); arsort($counts); usort($array, fn($a, $b) => $counts[$b] <=> $counts[$a]); var_export($array);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
array ( 0 => 'b', 1 => 'b', 2 => 'b', 3 => 'b', 4 => 'b', 5 => 'c', 6 => 'c', 7 => 'c', 8 => 'a', 9 => 'a', 10 => 'd', )
Output for 7.2.34
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ',' or ')' in /in/rg88e on line 7
Process exited with code 255.
preferences:
93.64 ms | 1293 KiB | 4 Q