How to convert character encoding to utf8 in php

php method to convert character encoding to utf8:

function strToUtf8($str){
    $encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'));
    if($encode == 'UTF-8'){
        return $str;
    }else{
        return mb_convert_encoding($str, 'UTF-8', $encode);
    }
}

//mb_convert_encoding('String to be converted','Target encoding ','original encoding')
//mb_detect_encoding('string'):
mb_convert_encoding($str,'utf-8',mb_detect_encoding($str))

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