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<?php var_dump(array_filter(array_map('imageFilename', array())));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, function "imageFilename" not found or invalid function name in /in/57Bvu:4 Stack trace: #0 /in/57Bvu(4): array_map('imageFilename', Array) #1 {main} thrown in /in/57Bvu on line 4
Process exited with code 255.

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