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<?php function f() {} $r = new ReflectionFunction("f"); var_dump($r->getFileName()); var_dump($r->getStartLine()); $r = new ReflectionFunction("substr"); var_dump($r->getFileName()); var_dump($r->getStartLine());
Output for git.master_jit, git.master
string(9) "/in/GTLtn" int(1) bool(false) bool(false)

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