phpでPHP Warning: PHP Startup: Unable to load dynamic library

webサーバを引き継いだんだけど、phpがどうも調子悪い。変なエラーでるし。

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mbstring.so' - /usr/lib64/php/modules/mbstring.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysql.so' - /usr/lib64/php/modules/mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysqli.so' - /usr/lib64/php/modules/mysqli.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo.so' - /usr/lib64/php/modules/pdo.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so' - /usr/lib64/php/modules/pdo_mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0

 みたいな。なんだかなあ、と思っていたら、/etc/php.d の中にextensionの設定がどっさり入っていた。全部削ってかいけつー。