Solution to intercepting Chinese garbled characters in PHP_PHP tutorial

If the ASCii code is greater than 0xa0, it is half a Chinese character; understand substr(), mb_substr(), ord(). The commonly used encoding formats now are UTF8, GBK, GBK2312, and BIG5. GBK is an upgrade of GBK2312. Now what I encounter in development are basically UTF8, and GBK is commonly used on forum BBS. Today I wrote UTF8 by myself, and it worked fine in the test. After all, the ones copied from the Internet can be used, but if you have time, it is best to write them yourself, so that only what you get is yours.

The easiest way is to use

Example 1

The code is as follows

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代码如下	复制代码
echo substr("Hello world!",6); ?>输出： world! 例子 2 echo substr("Hello world!",6,5); ?>

echo substr("Hello world!",6);

?>Output:

world!

Example 2
echo substr("Hello world!",6,5);
?>

There is no problem in English, but there is a problem in Chinese. Below we use the mb_substr function to deal with it.

代码如下	复制代码
if(function_exists(‘mb_string’)) { mb_substr($string,$start,$length,$encoding); //other codes here } else mysubstr($string,$start,$length);// 调用自己的函数 ?>

/**

*————————————————————————————————————————

代码如下	复制代码
/** *———————————- *首先定义自己的函数： *———————————- */ function mysubstr($string, $start, $length) { if(strlen($string)>$length) { $str=”; $len=$start+$length; for($i=$start;$i<$len;$i++) { if(ord(substr($string,$i,1))>0xa0) { $str.=substr($string,$i,2); $i++; } else{ $str.=substr($string,$i,1);} } return $str.’…’; } else{ return $string;} }

*PHP has an mbstring extension library that can be used (a friend was asked this question when interviewing for PHP), but * Most servers do not open php_mbstring.dll, you need to open it in *Open php_mbstring.dll in php.ini. If you don't have permission, you have to contact your ISP. *Because mb_string is more efficient, we first check whether mb_string can be used: *————————————————————————————————————————*/

The code is as follows	Copy code
if(function_exists(‘mb_string’)) { mb_substr($string,$start,$length,$encoding); //other codes here } else mysubstr($string,$start,$length);//Call your own function ?>

First define your own function

The code is as follows	Copy code
/**<🎜> *————————————-<🎜> *First define your own function: <🎜> *————————————-<🎜>*/<🎜> function mysubstr($string, $start, $length)<🎜> {<🎜> if(strlen($string)>$length) { $str=”; $len=$start+$length; for($i=$start;$i<$len;$i++)<🎜> {<🎜> if(ord(substr($string,$i,1))>0xa0) { $str.=substr($string,$i,2); $i++; } else{ $str.=substr($string,$i,1);} } return $str.’…’; } else{ return $string;} }

There is another issue to note. When using this method, the charset in your tag pair can only be set to Chinese encoding, such as GBK, GB2312.

The following is a commonly used Chinese and English character interception function

Customizing the Chinese string interception function is basically to write a function modeled after mb_substr and call it directly. The code I found below is actually very simple

The code is as follows

代码如下

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function substr_cn($string_input,$start,$length) { /* 功能: * 此算法用于截取中文字符串 * 函数以单个完整字符为单位进行截取,即一个英文字符和一个中文字符均表示一个单位长度 * 参数: * 参数$string为要截取的字符串, * 参数$start为欲截取的起始位置, * 参数$length为要截取的字符个数(一个汉字或英文字符都算一个) * 返回值: * 返回截取结果字符串 * */ $str_input=$string_input; $len=$length; $return_str=""; //定义空字符串 for ($i=0;$i<2*$len+2;$i++) $return_str=$return_str." "; $start_index=0; //计算起始字节偏移量 for ($i=0;$i<$start;$i++) { if (ord($str_input{$start_index}>=161))          //是汉语              {             $start_index+=2;         }         else                                          //是英文         {             $start_index+=1;         }             }         $chr_index=$start_index;     //截取     for ($i=0;$i<$len;$i++) { $asc=ord($str_input{$chr_index}); if ($asc>=161)         {             $return_str{$i}=chr($asc);             $return_str{$i+1}=chr(ord($str_input{$chr_index+1}));             $len+=1; //结束条件加1             $i++;    //位置偏移量加1             $chr_index+=2;             continue;                     }         else          {             $return_str{$i}=chr($asc);             $chr_index+=1;         }     }         return trim($return_str); }//end of substr_cn ?>

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function substr_cn($string_input,$start,$length)
{
/* Function:
* This algorithm is used to intercept Chinese strings
* The function intercepts in units of a single complete character, that is, one English character and one Chinese character both represent one unit length
* Parameters:
* The parameter $string is the string to be intercepted,
* The parameter $start is the starting position to be intercepted,
* The parameter $length is the number of characters to be intercepted (one Chinese character or English character counts as one)
* Return value:
* Returns the intercepted result string
* */
$str_input=$string_input;
$len=$length;
$return_str="";
//Define empty string
for ($i=0;$i<2*$len+2;$i++)
          $return_str=$return_str." ";
$start_index=0;
//Calculate starting byte offset
for ($i=0;$i<$start;$i++)
{
If (ord($str_input{$start_index}>=161)) //It is Chinese                                                                                                                 $start_index+=2;
                                                                                                                                                                                                                                                                                                                         $start_index+=1;
                                                                               }  
$chr_index=$start_index;
//Interception
for ($i=0;$i<$len;$i++)
{
          $asc=ord($str_input{$chr_index});
If ($asc>=161)
                                                                                                                $return_str{$i}=chr($asc);
                $return_str{$i+1}=chr(ord($str_input{$chr_index+1}));
                 $len+=1; //Add 1 to the end condition
                                                                                                                                                                                                                                                                                        $chr_index+=2;
                  continue;                                                                                                 else  
                                                                                                               $return_str{$i}=chr($asc);
                $chr_index+=1;
                                            }  
Return trim($return_str);
}//end of substr_cn
?>

http://www.bkjia.com/PHPjc/632151.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632151.htmlTechArticleIf the ASCii code is greater than 0xa0, it is half a Chinese character; understand substr(), mb_substr(), ord(). The commonly used encoding formats now are UTF8, GBK, GBK2312, and BIG5. GBK is an upgrade of GBK2312. Now I encountered during development...