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@ 2013-12-14T02:48:37Z

<?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 git.master, git.master_jit, rfc.property-hooks: Warning: Undefined variable $obj in /in/GEn5n on line 35 Warning: Undefined property: htmlFilter::$ in /in/GEn5n on line 35 Fatal error: Uncaught Error: Call to a member function filter() on null in /in/GEn5n:35 Stack trace: #0 /in/GEn5n(49): htmlFilter->filter('\xE6\xB5\x8B\xE8\xAF\x95\xE4\xB8\x80\xE4\xB8\x8B') #1 {main} thrown in /in/GEn5n on line 35
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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