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<?php $arr=array(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8); $arr = array_reduce($arr, 'xor'); echo $arr[0];
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_reduce(): Argument #2 ($callback) must be a valid callback, function "xor" not found or invalid function name in /in/L1B0X:4 Stack trace: #0 /in/L1B0X(4): array_reduce(Array, 'xor') #1 {main} thrown in /in/L1B0X on line 4
Process exited with code 255.

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