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<?php $a = array('key.txt'); var_dump(file_get_contents($a));
Output for git.master, git.master_jit, rfc.property-hooks
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.

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