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<?php trait ClosureInATrait { public static function getConstInTrait() { return __LINE__; } } class ClassConstantTest { use ClosureInATrait; public static function getConstInClass() { return __CLASS__; } } $closureInClass = (new ReflectionMethod('ClassConstantTest','getConstInClass'))->getClosure(); $closureInTrait = (new ReflectionMethod('ClassConstantTest','getConstInTrait'))->getClosure(); echo 'Closure before bind: ' . PHP_EOL; echo 'Class closure: ' . PHP_EOL; var_dump($closureInClass()); echo 'Trait closure: ' . PHP_EOL; var_dump($closureInTrait()); $closureInClass = Closure::bind($closureInClass, null, 'stdClass'); $closureInTrait = Closure::bind($closureInTrait, null, 'stdClass'); echo 'Closure after bind: ' . PHP_EOL; echo 'Class closure: ' . PHP_EOL; var_dump($closureInClass()); echo 'Trait closure: ' . PHP_EOL; var_dump($closureInTrait());
Output for 7.0.0 - 7.1.0
Closure before bind: Class closure: string(17) "ClassConstantTest" Trait closure: int(7) Warning: Cannot bind closure to scope of internal class stdClass in /in/aDcb4 on line 30 Warning: Cannot bind closure to scope of internal class stdClass in /in/aDcb4 on line 31 Closure after bind: Class closure: Fatal error: Uncaught Error: Function name must be a string in /in/aDcb4:35 Stack trace: #0 {main} thrown in /in/aDcb4 on line 35
Process exited with code 255.
Output for 5.4.0 - 5.6.28
Closure before bind: Class closure: string(17) "ClassConstantTest" Trait closure: int(7) Closure after bind: Class closure: string(17) "ClassConstantTest" Trait closure: int(7)
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/aDcb4 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/aDcb4 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/aDcb4 on line 3
Process exited with code 255.