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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 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
bool(false) bool(false) NULL Notice: Undefined index: studentnummer in /in/FeN9v on line 18 NULL
Output for 7.3.32 - 7.3.33
bool(false) bool(false) NULL NULL
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.33, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
bool(false) bool(false) NULL Warning: Undefined array key "studentnummer" in /in/FeN9v on line 18 NULL
preferences:
25.73 ms | 1145 KiB | 14 Q