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run code in 150+ php & hhvm versions
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'. $this->obj->filter($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');
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
html过滤敏感词汇过滤测试一下
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/u5m7C on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_CLASS in /in/u5m7C on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/u5m7C on line 2
Process exited with code 255.