3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo preg_replace('/\//', '\\\\', "Using 4 slashes: a / b\n"); echo preg_replace('/\//', '\\\\\\\\', "Using 8 slashes: a / b\n");
Output for 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Using 4 slashes: a \ b Using 8 slashes: a \\ b
preferences:
110.41 ms | 408 KiB | 5 Q