Online PHP editor | refs for q8AHs

<?php function str_compare(string $left, string $right): int { $length = mb_strlen($left, '8bit'); if (mb_strlen($right, '8bit') !== $length) { throw new Exception('ct_select() expects two strings of equal length'); } $gt = 0; $eq = 1; $i = $length; while ($i > 0) { --$i; $leftCharCode = unpack('C', $left[$i])[1]; $rightCharCode = unpack('C', $right[$i])[1]; $gt |= (($rightCharCode - $leftCharCode) >> 8) & $eq; $eq &= (($rightCharCode ^ $leftCharCode) -1) >> 8; } return ($gt + $gt + $eq) - 1; } var_dump( str_compare('baaaaaaaa', 'aaaaaaaaa'), str_compare('aaaaaaaaa', 'aaaaaaaaa'), str_compare('aaaaaaaaa', 'baaaaaaaa') );