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<?php class X { } class XFactory { private $className = 'X'; private function getClassName() { return $this->className; } public function create() { return [ 'member without parens' => new $this->className, 'member with parens' => new $this->className(), // 'method without parens' => new $this->getClassName, # Does not work at all 'method with parens' => new $this->getClassName(), ]; } } $factory = new XFactory(); var_dump($factory->create());
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined property: XFactory::$getClassName in /in/ttGFa on line 22 Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/ttGFa:22 Stack trace: #0 /in/ttGFa(28): XFactory->create() #1 {main} thrown in /in/ttGFa on line 22
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined property: XFactory::$getClassName in /in/ttGFa on line 22 Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/ttGFa:22 Stack trace: #0 /in/ttGFa(28): XFactory->create() #1 {main} thrown in /in/ttGFa on line 22
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/ttGFa:22 Stack trace: #0 /in/ttGFa(28): XFactory->create() #1 {main} thrown in /in/ttGFa on line 22
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Notice: Undefined property: XFactory::$getClassName in /in/ttGFa on line 22 Fatal error: Class name must be a valid object or a string in /in/ttGFa on line 22
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ttGFa on line 18
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/ttGFa on line 18
Process exited with code 255.
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/ttGFa on line 9
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/ttGFa on line 9
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/ttGFa on line 9
Process exited with code 255.

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