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<?php function test(ReflectionFunctionAbstract $r) { var_dump($r->isClosure()); if ($r instanceof ReflectionMethod) { $rc = $r->getDeclaringClass(); $dc = $rc ? $rc->getName() : 'no declaring class'; } else { $dc = 'not a ReflectionMethod'; } var_dump($dc ?: '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());
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) string(22) "not a ReflectionMethod" string(1) "C" bool(true) string(1) "C" string(1) "C"

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