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run code in 300+ PHP versions simultaneously
<?php $str = "a"; echo $str; $b = $str + strval(1); echo $b;
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
a Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/umBbn:4 Stack trace: #0 {main} thrown in /in/umBbn on line 4
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
a Warning: A non-numeric value encountered in /in/umBbn on line 4 1
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20
a1

preferences:
234.5 ms | 404 KiB | 348 Q