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<?php class a { function __toString() { static $i = 0; $a = ['', 'a']; $r = $a[$i]; $i++; return $r; } } $a = new a; var_dump('' == $a and 'a' == $a); var_dump('' === (string)$a and 'a' === (string)$a);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) Warning: Undefined array key 2 in /in/OuP0K on line 8 Fatal error: Uncaught TypeError: a::__toString(): Return value must be of type string, null returned in /in/OuP0K:10 Stack trace: #0 /in/OuP0K(15): a->__toString() #1 {main} thrown in /in/OuP0K on line 10
Process exited with code 255.

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