call to undefined function mb_convert_encoding

Reference link:

Solutions under Windows

Open mbstring Library in php.ini: remove extension = PHP_ Semicolon before mbstring.dll

Solutions under Linux

First, install the PHP mbstring library file

yum install php-mbstring

After that, modify the/etc/PHP. INI file and add a sentence to it

After saving, restart the httpd service

service httpd restart

21442;- 32771;- 38142;- 255091;

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