A PHP Error was encountered

Severity: Core Warning

Message: PHP Startup: Unable to load dynamic library 'mysql' (tried: /usr/lib/php/20170718/mysql (/usr/lib/php/20170718/mysql: cannot open shared object file: No such file or directory), /usr/lib/php/20170718/mysql.so (/usr/lib/php/20170718/mysql.so: cannot open shared object file: No such file or directory))

Filename: Unknown

Line Number: 0

Backtrace: