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<?php interface Kubus { public function set_sisi($s); public function luas_kubus(); public function volume_kubus(); } interface Balok { public function luas_balok($p, $l); public function volume_balok($t); } class Hitung implements Kubus, Balok{ public $sisi; public function set_sisi($s) { $this->sisi = $s; return $this; } public function luas_kubus() { echo "Luas Kubus = " . $this->sisi * 2; return $this; } public function volume_kubus() { echo "Volume Kubus = " . $this->sisi * 3; return $this; } public function luas_balok($p, $l) { return; } public function volume_balok($t) { return; } } $hitung = new Hitung; echo $hitung->set_sisi(4)->luas_kubus()->volume_kubus();
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Luas Kubus = 8Volume Kubus = 12 Fatal error: Uncaught Error: Object of class Hitung could not be converted to string in /in/L1Qbb:38 Stack trace: #0 {main} thrown in /in/L1Qbb on line 38
Process exited with code 255.
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Luas Kubus = 8Volume Kubus = 12 Recoverable fatal error: Object of class Hitung could not be converted to string in /in/L1Qbb on line 38
Process exited with code 255.

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