PHP realizes mutual conversion between utf-8 and GB2312 encoding

 /********************************************
 *
 * Function name: get_utf8_to_gb ($value)
 * Function: Convert utf8 encoded string to gb2312 encoding
 * Author: Liu Xianzhong
 * Date: 2011-11-09
 *
 ***************** ****************************/
function get_utf8_to_gb($value){
 $value_1= $value;
 $value_2 = @iconv( "utf-8", "gb2312// IGNORE",$value_1);//Use @ to resist errors. If a character in the conversion string does not have a corresponding character in the target character set, then the part after this character will be ignored; that is, the content of the result string Incomplete, use //IGNORE at this time
 $value_3 = @iconv( "gb2312", "utf-8//IGNORE",$value_2);

 if (strlen($value_1) == strlen($value_3) )
 {
 return $value_2;
 }else
 {
 return $value_1;
 }
 }
 /********************************************
 *
 * Function name: get_gb_to_utf8 ($value)
 * Function: Convert gb2312 encoded string to utf8 encoding
 * Author: Liu Xianzhong
 * Date: 2011-11-09
 *
 ******************* ****************************/
 function get_gb_to_utf8($value){
 $value_1= $value;
 $value_2 = @iconv( "gb2312", "utf-8//IGNORE",$value_1);
 $value_3 = @iconv( "utf-8", "gb2312//IGNORE",$value_2);
 if (strlen($ value_1) == strlen($value_3))
 {
 return $value_2;
 }else
 {
 return $value_1;
 }
 }
 ?>