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run code in 300+ PHP versions simultaneously
<?php $x = $y;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined variable $y in /in/7TPTr on line 2
Output for 5.3.28 - 5.3.29, 5.4.18 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined variable: y in /in/7TPTr on line 2
Output for 7.3.32 - 7.3.33, 7.4.26
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.17
Notice: Undefined variable: y in /in/W3Dmc on line 2

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171.12 ms | 401 KiB | 254 Q