安装LDAP-php扩展

LDAP
−−with-ldap=DIR Include LDAP support
−−with-ldap-sasl=DIR LDAP: Include Cyrus SASL support
Debian/Ubuntu 需安装 libldap-2.4-2, libldap2-dev 依赖包。
Redhat/CentOS 需安装 openldap, openldap-devel 依赖包。