yum -y install php php-devel php-pear php-mysql php-gd php-mbstring libevent libevent-devel安装libevent扩展：
a. 下载：

wget http://pecl.php.net/get/libevent-0.1.0.tgz

b. 解压：

tar -xzf libevent-0.1.0.tgz

c. 进入目录：

cd libevent-0.1.0

d. 编译：

phpize./configure --with-php-config=/usr/bin/php-config

e. 安装：

make && make install

f. 开启扩展：
vim /etc/php.ini，添加

[libevent]extension=libevent.so

g. 测试：

php -m | grep event

display_errors = on # 允许php报告错误upload_max_filesize = 20M # 上传文件大小限制memory_limit = 512M # 内存使用量default_socket_timeout = 9999999999999 # 脚本超时时间，设置为无限大date.timezone = PRC # 修改时区为中国default_charset = "utf8" # 修改默认字符集为utf8完整配置文件参考：

[PHP]engine = Onshort_open_tag = Offasp_tags = Offprecision = 14output_buffering = 4096zlib.output_compression = Offimplicit_flush = Offunserialize_callback_func =serialize_precision = 17disable_functions =disable_classes =zend.enable_gc = Onexpose_php = Onmax_execution_time = 30max_input_time = 60memory_limit = 512Merror_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICTdisplay_errors = ondisplay_startup_errors = Offlog_errors = Onlog_errors_max_len = 1024ignore_repeated_errors = Offignore_repeated_source = Offreport_memleaks = Ontrack_errors = Offhtml_errors = Onvariables_order = "GPCS"request_order = "GP"register_argc_argv = Offauto_globals_jit = Onpost_max_size = 8Mauto_prepend_file =auto_append_file =default_mimetype = "text/html"doc_root =user_dir =enable_dl = Offfile_uploads = Onupload_max_filesize = 20Mmax_file_uploads = 20allow_url_fopen = Onallow_url_include = Offdefault_socket_timeout = 9999999999999default_charset = "utf8"[CLI Server]cli_server.color = On[Date]date.timezone = PRC[filter][iconv][intl][sqlite][sqlite3][Pcre][Pdo][Pdo_mysql]pdo_mysql.cache_size = 2000pdo_mysql.default_socket=[Phar][mail function]SMTP = localhostsmtp_port = 25sendmail_path = /usr/sbin/sendmail -t -imail.add_x_header = On[SQL]sql.safe_mode = Off[ODBC]odbc.allow_persistent = Onodbc.check_persistent = Onodbc.max_persistent = -1odbc.max_links = -1odbc.defaultlrl = 4096odbc.defaultbinmode = 1[Interbase]ibase.allow_persistent = 1ibase.max_persistent = -1ibase.max_links = -1ibase.timestampformat = "%Y-%m-%d %H:%M:%S"ibase.dateformat = "%Y-%m-%d"ibase.timeformat = "%H:%M:%S"[MySQL]mysql.allow_local_infile = Onmysql.allow_persistent = Onmysql.cache_size = 2000mysql.max_persistent = -1mysql.max_links = -1mysql.default_port =mysql.default_socket =mysql.default_host =mysql.default_user =mysql.default_password =mysql.connect_timeout = 60mysql.trace_mode = Off[MySQLi]mysqli.max_persistent = -1mysqli.allow_persistent = Onmysqli.max_links = -1mysqli.cache_size = 2000mysqli.default_port = 3306mysqli.default_socket =mysqli.default_host =mysqli.default_user =mysqli.default_pw =mysqli.reconnect = Off[mysqlnd]mysqlnd.collect_statistics = Onmysqlnd.collect_memory_statistics = Off[OCI8][PostgreSQL]pgsql.allow_persistent = Onpgsql.auto_reset_persistent = Offpgsql.max_persistent = -1pgsql.max_links = -1pgsql.ignore_notice = 0pgsql.log_notice = 0[Sybase-CT]sybct.allow_persistent = Onsybct.max_persistent = -1sybct.max_links = -1sybct.min_server_severity = 10sybct.min_client_severity = 10[bcmath]bcmath.scale = 0[browscap][Session]session.save_handler = filessession.use_cookies = 1session.use_only_cookies = 1session.name = PHPSESSIDsession.auto_start = 0session.cookie_lifetime = 0session.cookie_path = /session.cookie_domain =session.cookie_httponly =session.serialize_handler = phpsession.gc_probability = 1session.gc_divisor = 1000session.gc_maxlifetime = 1440session.bug_compat_42 = Offsession.bug_compat_warn = Offsession.referer_check =session.cache_limiter = nocachesession.cache_expire = 180session.use_trans_sid = 0session.hash_function = 0session.hash_bits_per_character = 5url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=fakeentry"[MSSQL]mssql.allow_persistent = Onmssql.max_persistent = -1mssql.max_links = -1mssql.min_error_severity = 10mssql.min_message_severity = 10mssql.compatability_mode = Offmssql.secure_connection = Off[Assertion][mbstring][gd][exif][Tidy]tidy.clean_output = Off[soap]soap.wsdl_cache_enabled=1soap.wsdl_cache_dir="/tmp"soap.wsdl_cache_ttl=86400soap.wsdl_cache_limit = 5[sysvshm][ldap]ldap.max_links = -1[mcrypt][dba][libevent]extension=libevent.so