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<?php $a = new class { function __toString() { return "_"; } }; var_dump(implode($a, ["a", "b"])); var_dump(implode(["a", "b"], $a));
Output for git.master, git.master_jit, rfc.property-hooks
string(3) "a_b" Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, class@anonymous given in /in/4FWBj:8 Stack trace: #0 /in/4FWBj(8): implode(Array, Object(class@anonymous)) #1 {main} thrown in /in/4FWBj on line 8
Process exited with code 255.

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