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run code in 300+ PHP versions simultaneously
<?php $stream = fopen('php://stdout'); var_dump(posix_isatty($stream));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught ArgumentCountError: fopen() expects at least 2 arguments, 1 given in /in/Y2RHb:2 Stack trace: #0 /in/Y2RHb(2): fopen('php://stdout') #1 {main} thrown in /in/Y2RHb on line 2
Process exited with code 255.
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: fopen() expects at least 2 parameters, 1 given in /in/Y2RHb on line 2 bool(false)
Output for 7.1.10

Process exited with code 137.

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197.06 ms | 401 KiB | 311 Q