database connect failed!Can't connect to MySQL server on '127.0.0.1' (13)

php链接数据库，出现如下错误

database connect failed!Can't connect to MySQL server on '127.0.0.1' (13)

解决办法：

[root@localhost ~]# getsebool -a | grep httpd

allow_httpd_anon_write --> off

allow_httpd_mod_auth_ntlm_winbind --> off

allow_httpd_mod_auth_pam --> off

allow_httpd_sys_script_anon_write --> off

httpd_builtin_scripting --> on

httpd_can_check_spam --> off
httpd_can_network_connect --> off

httpd_can_network_connect_cobbler --> off

httpd_can_network_connect_db --> off

httpd_can_network_memcache --> off

httpd_can_network_relay --> off

httpd_can_sendmail --> off

httpd_dbus_avahi --> on

httpd_enable_cgi --> on

httpd_enable_ftp_server --> off

httpd_enable_homedirs --> off

httpd_execmem --> off

httpd_manage_ipa --> off

httpd_read_user_content --> off

httpd_run_stickshift --> off

httpd_serve_cobbler_files --> off

httpd_setrlimit --> off

httpd_ssi_exec --> off

httpd_tmp_exec --> off

httpd_tty_comm --> on

httpd_unified --> on

httpd_use_cifs --> off

httpd_use_fusefs --> off

httpd_use_gpg --> off

httpd_use_nfs --> off

httpd_use_openstack --> off

httpd_verify_dns --> off

所以，执行如下命令，ok

[root@localhost ~]# setsebool httpd_can_network_connect 1