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<?php class Foo { private $holder; private $children; public function __construct($content = '', array $children = []) { $this->holder = $content; $this->setChildren($children); } public function setChildren(array $children) { $this->children = $children; foreach ($children as $child) { $child->setParent($this); } } } class Bar { private $holder; private $parent; public function __construct($content = '', Foo $parent = null) { $this->holder = $content; $this->setParent($parent); } public function setParent(Foo $parent = null) { $this->parent = $parent; } } $child0 = new Bar('child#0'); $child1 = new Bar('child#1'); //same $child2 = new Bar('child#0'); $child3 = new Bar('child#1'); $parent0 = new Foo('parent', [$child0, $child1]); $parent1 = new Foo('parent', [$child2, $child3]); //Fatal: var_dump($parent0 == $parent1);
Output for 8.4.1 - 8.4.12
Deprecated: Bar::__construct(): Implicitly marking parameter $parent as nullable is deprecated, the explicit nullable type must be used instead in /in/6Huqf on line 29 Deprecated: Bar::setParent(): Implicitly marking parameter $parent as nullable is deprecated, the explicit nullable type must be used instead in /in/6Huqf on line 35 Fatal error: Uncaught Error: Nesting level too deep - recursive dependency? in /in/6Huqf:51 Stack trace: #0 {main} thrown in /in/6Huqf on line 51
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25
Fatal error: Nesting level too deep - recursive dependency? in /in/6Huqf on line 51
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6Huqf on line 9
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/6Huqf 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/6Huqf on line 5
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/6Huqf on line 5
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/6Huqf on line 5
Process exited with code 255.
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