在字符串上检测并转换utf-8

Posted 2021-02-23

I can't say I can rely on mb_detect_encoding(). Had some freaky false positives a while back. The following code will detect when you need to enconde or decode it.

if (preg_match('!!u', $string))
{
   // this is utf-8
}
else 
{
   // definitely not utf-8
}