What should I do if the question mark in php is garbled?

Solution to the garbled question mark in php: First use [mb_substr()], the code is [409b70f5a67511669e636bb4760ee0dc ]; Then use the last parameter of [mb_substr()] to add encoding.

Solution to php question mark garbled code:

The original code is:

<?php echo substr($res[&#39;art_title&#39;],0,20);?>

I learned that substr() would cause garbled characters when intercepting Chinese characters, so I changed it to mb_substr()

<?php echo mb_substr($res[&#39;art_title&#39;],0,20);?>

. The local test was normal for a while, and then I changed the server and went online. After that, garbled characters appeared again

The query said it was because the encoding of the web page file and the database were different

I clearly remember that I set utf8 for both the database and the page file,

But I also found a solution, mb_substr()Just add the encoding to the last parameter

<?php echo mb_substr($res[&#39;art_title&#39;],0,20,"utf-8");?>

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