PHP string encoding interception function (compatible with utf-8 and gb2312)_PHP tutorial

Copy code The code is as follows:

//Intercept the length of the string. Supports utf-8 and gb2312 encoding. If it is gb2312, first convert it to utf-8, intercept it based on utf-8 and then convert it back
function cut_string($str,$from=1,$length=10,$code='utf- 8',$rear='...'){
if($code!='utf-8'){//Always convert the string to utf-8 encoding
$str=iconv( $code,'utf-8',$str);
}
$str_len=mb_strlen($str,'utf-8');//The length of the string
if($from>$ str_len){//If the starting position of interception is greater than the length of the string, intercept the following $length
$from=$str_len-$length+1;
$from=($from<1?1:$from) ;
}
//Compatible with ucs-4 encoding
$i=0;//Byte count
$from_i=0;//The byte position to start interception
$from_len= 0;//Start character position to intercept
$tag=true;//Mark whether $from_len has been assigned
for($temp_len=0;($temp_len-$from_len<$length)||$tag ;$temp_len++){
$byte_code=ord(substr($str,$i,1));//One byte encoding
if($temp_len+1==$from){//Record The starting byte position to start intercepting
                                                                                                                                                                                                                                       through It occupies a few bytes. UTF-8 is a variable length encoding. According to the first byte of each character, you can determine how many bytes the character occupies.
$i++;
}
if( $byte_code>191&&$byte_code<224){
                                                                            $i+=3;
}
if($byte_code>239&&$byte_code<248){
$i+=4;
}
if($byte_code>248&&$byte_code<252){
             $i+=5;
                                                                                                     f-8',$code,substr ($str,$from_i,$i-$from_i).$rear);
}





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Copy code The code is as follows: //Intercept the length of the string. Supports utf-8 and gb2312 encoding. If it is gb2312, first convert it to utf-8, intercept it based on utf-8 and then convert it back function cut...