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Bugs & Features
<?php abstract class messageDetail { abstract function filter($msg); } class setmessage extends messageDetail { public function filter($msg) { return $msg; } } class messageHandle extends messageDetail { public $message; public $obj; public function __construct($obj) { $this -> obj = $obj; } public function filter($msg) { $this -> message = $msg; } } class htmlFilter extends messageHandle { public function filter($msg) { parent::filter($msg); return 'html过滤'. $obj->filter($msg); } } class ensitiveFilter extends messageHandle { public function filter($msg) { parent::filter($msg); return '敏感词汇过滤'.$this->message; } } $obj = new htmlFilter(new ensitiveFilter(new setmessage())); echo $obj -> filter('测试一下');

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Output for Typed properties v2
Notice: Undefined variable: obj in /in/67P2A on line 35 Fatal error: Uncaught Error: Call to a member function filter() on null in /in/67P2A:35 Stack trace: #0 /in/67P2A(49): htmlFilter->filter('\xE6\xB5\x8B\xE8\xAF\x95\xE4\xB8\x80\xE4\xB8\x8B') #1 {main} thrown in /in/67P2A on line 35
Output for Array change keys
Notice: Undefined variable: obj in /in/67P2A on line 35 Fatal error: Uncaught Error: Call to a member function filter() on null in /in/67P2A:35 Stack trace: #0 /in/67P2A(49): htmlFilter->filter('\xE6\xB5\x8B\xE8\xAF\x95\xE4\xB8\x80\xE4\xB8\x8B') #1 {main} thrown in /in/67P2A on line 35
Output for Lexical anon
Notice: Undefined variable: obj in /in/67P2A on line 35 Catchable fatal error: Call to a member function filter() on null in /in/67P2A on line 35

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