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<?php class Student { public $studentnummer; public $voornaam; } $student = new Student(); $student->voornaam = 'Barry'; $data = ['voornaam' => 'Barry']; var_dump(isset($student->studentnummer)); var_dump(isset($data['studentnummer'])); var_dump($student->studentnummer); var_dump($data['studentnummer']);
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) NULL Warning: Undefined array key "studentnummer" in /in/FeN9v on line 18 NULL

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