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<?php class Container { public function getObject() { $this->object = new StringableObject(); return $this->object; } // This destructor is required to exist to trigger the segfault public function __destruct() { } } class StringableObject { public function __toString() { $this->test = $this; return 'test123'; } } $container = new Container(); $object = $container->getObject(); // Any kind of function which triggers a 'to string' object conversion // Casting $object with (string) will circumvent the problem echo trim($object); // Another call is required to corrupt heap echo trim('test');
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Creation of dynamic property Container::$object is deprecated in /in/MbW5b on line 6 Deprecated: Creation of dynamic property StringableObject::$test is deprecated in /in/MbW5b on line 21 test123test
Output for 5.2.0 - 5.2.17, 5.3.11 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
test123test
Output for 5.3.0 - 5.3.10
test123test
Process exited with code 139.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Notice: Object of class StringableObject to string conversion in /in/MbW5b on line 32 Objecttest
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/MbW5b on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/MbW5b on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/MbW5b on line 4
Process exited with code 255.
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231.35 ms | 401 KiB | 328 Q