3v4l.org

run code in 300+ PHP versions simultaneously
<?php // This produces errors $a = $x ? $x : $y; // This desn't produce errors (only PHP 7) $aa = $xx ?? $yy;
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
Warning: Undefined variable $x in /in/G56Sa on line 4 Warning: Undefined variable $y in /in/G56Sa on line 4 Warning: Undefined variable $yy in /in/G56Sa on line 7
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: x in /in/G56Sa on line 4 Notice: Undefined variable: y in /in/G56Sa on line 4 Notice: Undefined variable: yy in /in/G56Sa on line 7
Output for 7.3.32 - 7.3.33
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/G56Sa on line 7
Process exited with code 255.
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176.56 ms | 402 KiB | 198 Q