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<?php $a = tempnam(); var_dump($a);
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
Fatal error: Uncaught ArgumentCountError: tempnam() expects exactly 2 arguments, 0 given in /in/2p5SC:3 Stack trace: #0 /in/2p5SC(3): tempnam() #1 {main} thrown in /in/2p5SC on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: tempnam() expects exactly 2 parameters, 0 given in /in/2p5SC on line 3 NULL

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130.96 ms | 402 KiB | 167 Q