代码语言：javascript复制
/**
* 编码改成utf-8
* @param $str
* @return bool|null|string|string[]
*/
public static function strToUtf8($str)
{
$encode = mb_detect_encoding($str, ["ASCII", 'UTF-8', "GB2312", "GBK", 'BIG5']);
if ($encode == 'UTF-8') {
return $str;
} else {
return mb_convert_encoding($str, 'UTF-8', $encode);
}
}
