3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('a', 'b', 'c', 'd', null); for($i = 0; $i < count($a); $i += 2) { echo $i . " "; if (array_key_exists($i + 1, $a)) { echo $a[$i + 1] . " "; } echo ($i + 1) . PHP_EOL; } $n = explode('|', $n); var_dump($n);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
0 b 1 2 d 3 4 5 Warning: Undefined variable $n in /in/DQbE3 on line 12 Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /in/DQbE3 on line 12 array(1) { [0]=> string(0) "" }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 0 b 1 2 d 3 4 5 Warning: Undefined variable $n in /in/DQbE3 on line 12 Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /in/DQbE3 on line 12 array(1) { [0]=> string(0) "" }
Output for 8.0.0 - 8.0.30
0 b 1 2 d 3 4 5 Warning: Undefined variable $n in /in/DQbE3 on line 12 array(1) { [0]=> string(0) "" }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
0 b 1 2 d 3 4 5 Notice: Undefined variable: n in /in/DQbE3 on line 12 array(1) { [0]=> string(0) "" }
Output for 7.3.32 - 7.3.33
0 b 1 2 d 3 4 5 array(1) { [0]=> string(0) "" }
preferences:
179 ms | 401 KiB | 173 Q