3v4l.org

run code in 300+ PHP versions simultaneously
<?php const API_KEY = 'de527b836bf340274089f76a6aef03610d88585464d07e625bdec9735b8125bf'; echo API_KEY + 'test'; echo PHP_EOL; echo API_KEY . 'test'; echo PHP_EOL; echo 'X' + 'Y' === 0; echo PHP_EOL;
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
Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/5nNob:5 Stack trace: #0 {main} thrown in /in/5nNob on line 5
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: A non-numeric value encountered in /in/5nNob on line 5 Warning: A non-numeric value encountered in /in/5nNob on line 5 0 de527b836bf340274089f76a6aef03610d88585464d07e625bdec9735b8125bftest Warning: A non-numeric value encountered in /in/5nNob on line 9 Warning: A non-numeric value encountered in /in/5nNob on line 9 1
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
0 de527b836bf340274089f76a6aef03610d88585464d07e625bdec9735b8125bftest 1

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144.27 ms | 402 KiB | 183 Q