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<?php class a { protected $v; function __toString() { return $this->v; } } class b { protected $v; function __toString() { return $this->v; } } $a = new a(); $b = new b(); echo $a . $b;
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: a::__toString(): Return value must be of type string, null returned in /in/aECjk:10 Stack trace: #0 /in/aECjk(28): a->__toString() #1 {main} thrown in /in/aECjk on line 10
Process exited with code 255.

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