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<?php class a { static $i =0; function __toString() { $a = ['', 'a']; $r = $a[$i]; $i++; return $r; } } $a = new a; var_dump('' == $a and 'a' == $a);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $i in /in/Q10lr on line 7 Warning: Undefined array key "" in /in/Q10lr on line 7 Warning: Undefined variable $i in /in/Q10lr on line 8 Fatal error: Uncaught TypeError: a::__toString(): Return value must be of type string, null returned in /in/Q10lr:9 Stack trace: #0 /in/Q10lr(13): a->__toString() #1 {main} thrown in /in/Q10lr on line 9
Process exited with code 255.

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