php中文繁体和简体相互转换的方法

<?php
class utf8_chinese
{
  private $utf8_gb2312;
  private $utf8_big5;
  private $data;
  public function __construct($data){
      $this->utf8_gb2312 = $data['sim'];
      $this->utf8_big5 = $data['tra'];
  }
  public function gb2312_big5($str) {
    $str_t = '';
    $len = strlen($str);
    $a = 0;
    while ($a < $len){
      if (ord($str{$a})>=224 && ord($str{$a})<=239){
        if (($temp = strpos( $this->utf8_gb2312, $str{$a} . $str{$a+1} . $str{$a+2})) !== false){
          $str_t .= $this->utf8_big5{$temp} . $this->utf8_big5{$temp+1} . $this->utf8_big5{$temp+2};
          $a += 3;
          continue;
        }
      }
      $str_t .= $str{$a};
      $a += 1;
    }
    return $str_t;
  }
  public function big5_gb2312($str) {
    $str_t = '';
    $len = strlen($str);
    $a = 0;
    while ($a < $len){
      if (ord($str{$a})>=224 && ord($str{$a})<=239){
        if (($temp = strpos( $this->utf8_big5, $str{$a} . $str{$a+1} . $str{$a+2})) !== false){
          $str_t .= $this->utf8_gb2312{$temp} . $this->utf8_gb2312{$temp+1} . $this->utf8_gb2312{$temp+2};
          $a += 3;
          continue;
        }
      }
      $str_t .= $str{$a};
      $a += 1;
    }
    return $str_t;
  }
}
$_UTF8_TRA = array (
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);
function cns($str){
global $_UTF8_TRA;
$chinese = new utf8_chinese($_UTF8_TRA);
$str_big5 = $chinese->gb2312_big5($str);
return $str_big5;
}