How to convert php string to utf8

How to convert php string to utf8: First create a PHP sample file; then define a "strToUtf8" method; finally implement encoding conversion through functions such as "mb_detect_encoding".

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php converts character encoding to utf-8

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);
    }
}

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