关于xxx.so，今天在安装php的模块时候老是报，xxx.so的问题，虽然不影响使用，但作为一名当年的程序员强迫症患者，誓死要把
他搞清楚，后面发现是删除了也没有影响，因为在安装php的时候已经将他们编译进去了，不用重复添加这些模块了，
不信你删除警告的模块，然后执行php -m，看看，肯定有这些模块。
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'ctype.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'filter.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'hash.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'json.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (appears to be a Zend Extension, try loading using zend_extension=opcache.so from php.ini) in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'pdo.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'pdo_sqlite.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'phar.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'posix.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'session.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'simplexml.so' in Unknown on line 0
PHP Warning: Module 'tokenizer' already loaded in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'xmlreader.so' in Unknown on line 0
PHP Warning: PHP Startup: Invalid library (maybe not a PHP library) 'xmlwriter.so' in Unknown on line 0