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<?php interface classThing { public function getClass(); public function setClass($class); } class Something implements classThing { private $class; public function setClass($class) { $this->class = $class; } public function getClass() { return $this->class; } } $header = array(new Something); if ($header[0] instanceof classThing && (($class = $header[0]->getClass()) !== false)) { echo $class; } else { echo 'not set'; } $header[0]->setClass('bla'); if ($header[0] instanceof classThing && (($class = $header[0]->getClass()) !== false)) { echo $class; } else { echo 'not set'; } $header[0]->setClass(false); if ($header[0] instanceof classThing && (($class = $header[0]->getClass()) !== false)) { echo $class; } else { echo 'not set'; }
Output for git.master, git.master_jit, rfc.property-hooks
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