分享几个php转内容编码的函数(utf-8,gb2312,gbk)

分享几个php转内容编码的函数(utf-8,gb2312,gbk)
方便处理不同编码的程序转换
//作者好主题网
//utf8转换为gbk
function utf8_to_gbk($str){
return mb_convert_encoding($str, 'gbk', 'utf-8');
}
//转换编码--将所有编码的字符串内容都转换为utf-8
function str_to_utf8($str)
{
if(!empty($str) ){
$encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5')); 
if( $encode != 'UTF-8'){
$str = mb_convert_encoding($str, 'utf-8', $encode);
}
}
return $str;
}//转换编码--将所有编码的字符串内容都转换为GB2312
function str_to_GB2312($str){
$encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5')); 
$str_encode = mb_convert_encoding($str, 'GB2312', $encode);
return $str_encode;
}
//转换编码--将所有编码的字符串内容都转换为GBK
function str_to_GBK($str){
$encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5')); 
$str_encode = mb_convert_encoding($str, 'GBK', $encode);
return $str_encode;
}