How did I fix «Unable to load dynamic library '/usr/lib64/php/modules/mbstring.so'» / «No such file or directory» for PHP 7.1 in CentOS 7.6?

PHP
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2

Step 1

yum search mbstring

02

stackoverflow.com/a/56709779

Step 2

yum install php71-php-mbstring.x86_64

stackoverflow.com/a/56709779

Step 3

find / -name "mbstring.so" -print 2>/dev/null

04

Step 4

ln -s /opt/remi/php71/root/usr/lib64/php/modules/mbstring.so /usr/lib64/php/modules/mbstring.so