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<?php class Foo { public static function fooBar() { return 'Hello World'; } } $callable = 'Foo:fooBar'; var_dump(is_callable($callable)); var_dump(call_user_func($callable));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, function "Foo:fooBar" not found or invalid function name in /in/hC9G6:13 Stack trace: #0 {main} thrown in /in/hC9G6 on line 13
Process exited with code 255.

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