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run code in 150+ php & hhvm versions
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<?php function test(ReflectionFunctionAbstract $r) { var_dump($r->isClosure()); if ($r instanceof ReflectionMethod) { $dc = $r->getDeclaringClass(); } var_dump($dc ? $dc->getName() : 'no declaring class'); $csc = $r->getClosureScopeClass(); var_dump($csc ? $csc->getName() : 'no closure scope class'); echo "\n\n"; } class C { function f() { return function($p) {}; } } $c = new C; $cl = $c->f(); // instantiate ReflectionFunction directly on closure $rf = new ReflectionFunction($cl); test($rf); // get ReflectionFunction via one of the initial ReflectionFunction's ReflectionParameter objects $rps = $rf->getParameters(); $rp = $rps[0]; test($rp->getDeclaringFunction());
based on MMvgW
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
bool(true) Notice: Undefined variable: dc in /in/sPZdI on line 7 string(18) "no declaring class" string(1) "C" bool(true) string(1) "C" string(1) "C"
Output for hhvm-3.12.0
bool(true) Notice: Undefined variable: dc in /in/sPZdI on line 7 string(18) "no declaring class" string(1) "C" bool(false) string(23) "Closure$C::f;1921045956" string(22) "no closure scope class"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
bool(true) Notice: Undefined variable: dc in /in/sPZdI on line 7 string(18) "no declaring class" Fatal error: Call to undefined method ReflectionFunction::getClosureScopeClass() in /in/sPZdI on line 8
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/sPZdI on line 15
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/sPZdI on line 15
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/sPZdI on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/sPZdI on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/sPZdI on line 2
Process exited with code 255.