3v4l.org

run code in 300+ PHP versions simultaneously
<?php $input = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"; echo $input . "\n"; echo hex2bin($input ^ a) . "\n"; ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736 Fatal error: Uncaught Error: Undefined constant "a" in /in/6JlOm:6 Stack trace: #0 {main} thrown in /in/6JlOm on line 6
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736 Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/6JlOm on line 6 Warning: hex2bin(): Hexadecimal input string must have an even length in /in/6JlOm on line 6
Output for 5.4.4 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736 Notice: Use of undefined constant a - assumed 'a' in /in/6JlOm on line 6 Warning: hex2bin(): Hexadecimal input string must have an even length in /in/6JlOm on line 6
Output for 5.4.2 - 5.4.3
1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736 Notice: Use of undefined constant a - assumed 'a' in /in/6JlOm on line 6

preferences:
232.58 ms | 401 KiB | 269 Q