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<?php class T{ public $value; public $ref; function equals($other, $origin = null){ if($this->value !== $other->value) return false; if($this->ref === ($origin ?? $this)) return true; return $this->ref->equals($other->ref, $origin ?? $this); } } $a1 = new T; $a1->value = 10; $a2 = new T; $a2->value = 20; $a3 = new T; $a3->value = 30; $a1->ref = $a2; $a2->ref = $a3; $a3->ref = $a1; $b1 = new T; $b1->value = 10; $b2 = new T; $b2->value = 20; $b3 = new T; $b3->value = 30; $b1->ref = $b2; $b2->ref = $b3; $b3->ref = $b1; var_dump($a1->equals($b1)); $b3->value +=10; var_dump($a1->equals($b1));
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(false)
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Parse error: syntax error, unexpected '?' in /in/YOb9S on line 9
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '?' in /in/YOb9S on line 9
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/YOb9S on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/YOb9S on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/YOb9S on line 4
Process exited with code 255.
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