'; $lines = file('test.txt'); $str_start = xdebug_time_index(); foreach ($lines as $line) { $str_lines[] = str_replace($pattern, $new_pattern, $line); } $str_end = xdebug_time_index(); $preg_start = xdebug_time_index(); foreach ($lines as $line) { $preg_lines[] = preg_replace("#{$pattern}#", $new_pattern, $line); } $preg_end = xdebug_time_index(); echo ('str_replace time = ' . round($str_end - $str_start, 5)); echo '
'; echo ('preg_replace time = ' . round(($preg_end - $preg_start), 5)); file_put_contents('str.txt', $str_lines); file_put_contents('preg.txt', $preg_lines);