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<?php $key; $theme; $key = array_keys($theme)[0];
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $theme in /in/rRLUu on line 4 Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /in/rRLUu:4 Stack trace: #0 /in/rRLUu(4): array_keys(NULL) #1 {main} thrown in /in/rRLUu on line 4
Process exited with code 255.

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