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实用技巧:PHP截取中文字符串的问题_PHP

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Release: 2016-06-01 12:30:43
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以下代码试用于GB2312编码,截取中文字符串是PHP中一个头疼的问题,解决方法是根据值是否大于等于128来判断是否是双字节字符,以避免出现乱码的情况。但中英文混合、特殊符号等问题总是存在,现在写一个比较全面的,仅供参考:

程序说明:

1. len 参数以中文字符为标准,1len等于2个英文字符,为了形式上好看些

2. 如果将magic参数设为false,则中文和英文同等看待,取绝对的字符数

3. 特别适用于用htmlspecialchars()进行过编码的字符串

4. 能正确处理GB2312中实体字符模式(𖰰)

程序代码:

<ccid_code>function FSubstr($title,$start,$len="",$magic=true) 

{

/**

  *  powered by Smartpig

  *  mailto:d.einstein@263.net

  */

  

$length = 0;

if($len == "") $len = strlen($title);



//判断起始为不正确位置

if($start > 0)

{

  $cnum = 0;

  for($i=0;$i= 128) $cnum   ;

  }

  if($cnum%2 != 0) $start--;

  

  unset($cnum);

}



if(strlen($title)=128)

   {

    $cstep = 2;

    $length  = 2;

    $i  = 1;

    $realnum   ;

    if($magic)

    {

     $blen   ;

     $ctype = 1;

    }

   }else{

    $cstep = 1;

    $length  =1;

    $realnum   ;

    if($magic)

    {

     $alen  ;

    }

   }

  }

  

  if($magic)

  {

   if(($blen*2 $alen) == ($len*2)) break;

   if(($blen*2 $alen) == ($len*2 1))

   {

    if($ctype == 1)

    {

     $length -= $cstep;

     break;

    }else{

     break;

    }

   }

  }else{

   if($realnum == $len) break;

  }

}



unset($cur);

unset($alen);

unset($blen);

unset($realnum);

unset($ctype);

unset($cstep);



return substr($title,$start,$length);

}</ccid_code>
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