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<?php set_error_handler(function (int $severity, string $message, string $filename, int $line) { echo "throwing\n"; throw new ErrorException($message, 0, $severity, $filename, $line); }); $stdObject = new stdClass(); //Can't be casted to string //array_diff compares array items CASTING them to string //http://php.net/manual/en/function.array-diff.php try { array_diff([], [$stdObject]); }catch(ErrorException $ee){ echo "Catched exception: " . $ee->getMessage() . "\n"; } echo "\n----------\n"; try { array_diff([$stdObject], []); }catch(ErrorException $ee){ echo "Catched exception: " . $ee->getMessage() . "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
---------- Fatal error: Uncaught Error: Object of class stdClass could not be converted to string in /in/RYIo5:22 Stack trace: #0 /in/RYIo5(22): array_diff(Array, Array) #1 {main} thrown in /in/RYIo5 on line 22
Process exited with code 255.

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