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<?php class ClassOne { protected $a = 10; public function changeValue($b) { $this->a = $b; } } class ClassTwo extends ClassOne { protected $b = 10; public function changeValue($b) { $this->b = 10; parent::changeValue($this->a + $this->b); } public function displayValues() { print "a: {$this->a}, b: {$this->b}\n"; } } $obj = new ClassTwo(); $obj->changeValue(20); $obj->changeValue(10); $obj->displayValues();
Output for git.master, git.master_jit, rfc.property-hooks
a: 30, b: 10

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