When running a web server or running PHP scripts on the command line, you may encounter an error: PHP Warning: PHP Startup: Unable to load dynamic library 'xmlrpc.so' (tried: /usr/lib/php/modules/xmlrpc.so (/usr/lib/php/modules/xmlrpc.so: cannot open shared object file: No such file or directory), /usr/lib/php/modules/xmlrpc.so.so (/usr/lib/php/modules/xmlrpc.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 In fact,...