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<?php $a = array('key.txt'); var_dump(file_get_contents($a));
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: file_get_contents(): Argument #1 ($filename) must be of type string, array given in /in/BI0vN:3 Stack trace: #0 /in/BI0vN(3): file_get_contents(Array) #1 {main} thrown in /in/BI0vN on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: file_get_contents() expects parameter 1 to be a valid path, array given in /in/BI0vN on line 3 NULL
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
Warning: file_get_contents() expects parameter 1 to be string, array given in /in/BI0vN on line 3 NULL

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