About Data encoding conversion after collection! Excuse me

About Data encoding conversion after collection! Ask! I am working on a title acquisition program to display the collected data on the webpage. the webpage itself is utf8. I use this function: $ icn = mb_convert_encoding ($ arr1, 'utf-8', 'gb2312, GBK, BIG5, utf-8 '); after the experiment, we will discuss the problem of data encoding conversion after data collection! Ask!
I am working on a title acquisition program to display the collected data on the webpage. the webpage itself is utf8, and I use this function:
$ Icn = mb_convert_encoding ($ arr1, 'utf-8', 'gb2312, GBK, BIG5, utf-8 ');
After the experiment, we found that all other webpages are normal, but if the UTF-8-encoded webpage is captured, it will be garbled. how can this problem be solved?

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$ Icn = mb_convert_encoding ($ arr1, 'utf-8', mb_check_encoding ('utf-8 ')? 'Utf-8': 'gbk ');
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Icnov