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<?php $array = [ 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', ]; function multisort($array) { array_multisort(array_map('strlen', $array), SORT_DESC, $array); printf( "Total strlen() calls: %d\n%s\n---\n", count($array), var_export($array, true) ); } function usersort($array) { usort( $array, function($a, $b) { echo "strlen() called twice\n"; return strlen($b) <=> strlen($a); } ); var_export($array); echo "\n---\n"; } multisort($array); usersort($array);
Output for git.master, git.master_jit, rfc.property-hooks
Total strlen() calls: 9 array ( 0 => 'eight', 1 => 'seven', 2 => 'three', 3 => 'five', 4 => 'four', 5 => 'nine', 6 => 'one', 7 => 'six', 8 => 'two', ) --- strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice strlen() called twice array ( 0 => 'three', 1 => 'seven', 2 => 'eight', 3 => 'four', 4 => 'five', 5 => 'nine', 6 => 'one', 7 => 'two', 8 => 'six', ) ---

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