Substitution sensitive string class instance implemented by PHP

The StrFilter.class.php class files are as follows:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26-27--28 29---30 31--32 33 34 35 36 37 38-39 40 41 42 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 5 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114-115

<?php /** String Filter class  * date:   2013-01-09  * author:  fdipzone  * VER:&N bsp;  v1.0  *  * func:  * Public replace      replace illegal characters   * Public CHECK&NB sp;      check for illegal characters   * Private protect_white_list protection Whitelist   * Private Resume_white_ List Restore White list   * Private getval       Whitelist key to value  */  class strfilter{//C Lass start        private $_white_list = Array ();    private = Array ();    private $_replacement = ' * ';    private $_ltag = ' [[# # ';     Private $_rtag = ' # #]] ';        /**    * @param Array $white _list  & nbsp; * @param Array $black _list    * @param String $replacement     */   & Nbsp;public function __construct ($white _list=aRray (), $black _list=array (), $replacement = ' * ') {       $this->_white_list = $white _list;        $this->_black_list = $black _list;       $this->_ Replacement = $replacement;    }        /** replace illegal characters     * @ param string $content the strings to be replaced     * @return the string     string     */& nbsp   public function Replace ($content) {          if (!isset ($content ) || $content = = ") {        return ';      }           //Protect white list       $content = $this->protect _white_list ($content);          //replace black list       if ($this->_black_list) {       &Nbsp;foreach ($this->_black_list as $val) {           $content = str_ Replace ($val, $this->_replacement, $content);        }       }          //Resume white list      $ Content = $this->resume_white_list ($content);          return $content;     }        /** Check to see if there is an illegal character     * @param string $content string     * @return boolean    */    public function Check ($content) {          if (!isset ($content) | | | $content = = ") {         return true;      }          // Protect White list       $content = $this->protect_white_list ($content);          //check      if ($this->_ black_list) {        foreach ($this->_black_list as $val) {           if (Strstr ($content, $val)!= ') {             return false;          }         }      }      return true;     }        /** Protection white list     * @param string $content string      * @return string    */    private function protect_white_list ($content) {      if ($this->_white_list) {        foreach ($this-> _white_list as $key => $val) {           $content = str_rePlace ($val, $this->_ltag $key. $this->_rtag, $content);        }      }      return $content;    }         /** restore white list     * @param String $content     * @return string   & nbsp;*/    private function Resume_white_list ($content) {      if ($this- >_white_list) {         $content = Preg_replace_callback ("/[[##" (. *?) ##]].*?/si ", Array ($this, ' getval '), $content);      }       return $content;    }        /** Whitelist key revert to value    * @ param Array $matches match white_list key    * @return String white_list val    */    private function Getval ($matches) {      return isset ($this->_white_list[$matches [1]])? $this->_white_list[$matches [1]]: "; key->val    } }//Class end ?>

The demo example is as follows:

1 2 3 4 5 6 7 8 9 10 11 12-13

<?php header ("Content-type:text/html;charset=utf8");        Require ("StrFilter.class.php");    $white = array (' Cock silk ', ' Cao ');        $black = array (' Cock ', ' fuck ');        $content = "I fuck, caocao you are cock silk, I cock you ah";    $obj = new Strfilter ($white, $black);  echo $obj->replace ($content); ?>