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<?php
   function validate_email($email){

      $exp = "^[a-z\'0-9]+([._-][a-z\'0-9]+)*@([a-z0-9]+([._-][a-z0-9]+))+$";

      if(eregi($exp,$email)){

         if(checkdnsrr(array_pop(explode("@",$email)),"MX")){
            return true;
         }else{
            return false;
         }

      }else{

         return false;

      }   
   }

   echo validate_email('qq@qq.com');
?>

yum install gcc autoconf libxml2-devel openssl-devel curl-devel libmcrypt-devel
./configure --prefix=/usr/local/php \
--with-config-file-path=/etc/php \
--enable-fpm \
--enable-pcntl \
--enable-mysqlnd \
--enable-opcache \
--enable-sockets \
--enable-sysvmsg \
--enable-sysvsem  \
--enable-sysvshm \
--enable-shmop \
--enable-zip \
--enable-ftp \
--enable-soap \
--enable-xml \
--enable-mbstring \
--disable-rpath \
--disable-debug \
--disable-fileinfo \
--with-mysql=mysqlnd \
--with-mysqli=mysqlnd \
--with-pdo-mysql=mysqlnd \
--with-pcre-regex \
--with-iconv \
--with-zlib \
--with-mcrypt \
--with-gd \
--with-openssl \
--with-mhash \
--with-xmlrpc \
--with-curl \
--with-imap-ssl
make
make install

Debian7下安装：

echo 'deb http://dl.hhvm.com/debian wheezy main' >> /etc/apt/sources.list.d/hhvm.list
apt-get update
apt-get install hhvm

运行于Server模式：

Server {
  Port = 80
  ExposeHPHP = false
  SourceRoot = /var/www
}

Eval {
  Jit = true
  JitWarmupRequests=0
}

Log {
  Level = Error
  UseLogFile = true
  File = /var/log/hhvm/error.log
  Access {
    * {
      File = /var/log/hhvm/access.log
      Format = %h %l %u %t \"%r\" %>s %b
    }
  }
}

VirtualHost {
  * {
    Pattern = .*
    RewriteRules {
      dirindex {
        pattern = ^/(.*)/$
        to = $1/index.php
        qsa = true
      }
    }
  }
}

StaticFile {
  FilesMatch {
    * {
      pattern = .*\.(dll|exe)
      headers {
        * = Content-Disposition: attachment
      }
    }
  }
  Extensions {
    css = text/css
    gif = image/gif
    html = text/html
    jpe = image/jpeg
    jpeg = image/jpeg
    jpg = image/jpeg
    png = image/png
    tif = image/tiff
    tiff = image/tiff
    txt = text/plain
  }
}

运行于Fastcgi模式：

Server {
  Port = 9000
  Type=fastcgi
  ExposeHPHP = false
}

Eval {
  Jit = true
  JitWarmupRequests=0
}

Log {
  Level = Error
  UseLogFile = true
  File = /var/log/hhvm/error.log
  Access {
    * {
      File = /var/log/hhvm/access.log
      Format = %h %l %u %t \"%r\" %>s %b
    }
  }
}

启动HHVM：

hhvm -m daemon --config server.hdf

默认请求超过11次才启动JIT模式，修改为立即启动为JIT模式。

  JitWarmupRequests=0

CLI：

hhvm -v "Eval.Jit=true" f.php

集成的扩展：https://github.com/facebook/hhvm/wiki/Extensions
性能提升多少？看测试脚本：https://github.com/ckwalsh/php_hhvm_bench

已安装的软件包包含的文件：

dpkg -L mysql-server
rpm -ql mysql-server

查找文件属于本地哪个软件包：

dpkg -S /usr/bin/mysql
rpm -qf /usr/bin/mysql

查找文件属于网络源哪个软件包：

yum whatprovides */bin/mysql
yum whatprovides *mysql
apt-file search /usr/bin/mysql
apt-file search mysql

列出网络源软件包的文件：

yum install yum-utils
repoquery -ql mysql-server
apt-file list mysql-server

列出本地软件包所包含的文件：

rpm -qlp mysql-server.rpm
dpkg -c mysql-server.deb

列出本地已安装的软件包：

rpm -qa
dpkg -l

查看软件包的依赖关系：

yum deplist vim-enhanced
apt-rdepends vim
apt-cache rdepends vim