3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = $bar; if (isset($foo)){ echo 'foo is set'; }else{ echo ' not set'; }
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 $bar in /in/WMPfc on line 3 not set
Output for 7.1.25 - 7.1.30, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: bar in /in/WMPfc on line 3 not set
Output for 7.3.32 - 7.3.33
not set
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114.11 ms | 401 KiB | 168 Q