php实现MySQL数据库备份类

<?php
  /**
  *  
  *  @name php备份数据库 
  *  @param string  $DbHost    连接主机
  *  @param string  $DbUser    用户名
  *  @param string  $DbPwd    连接密码
  *  @param string  $DbName    要备份的数据库
  *  @param string  $saveFileName 要保存的文件名, 默认文件保存在当前文件夹中,以日期作区分
  *  @return Null
  *  @example backupMySqlData(&#39;localhost&#39;, &#39;root&#39;, &#39;123456&#39;, &#39;YourDbName&#39;);
  *
  */
  function backupMySqlData($DbHost, $DbUser, $DbPwd, $DbName, $saveFileName = &#39;&#39;)
  {
    header("Content-type:text/html;charset=utf-8");
    error_reporting(0);
    set_time_limit(0);

    echo &#39;数据备份中，请稍候......<br />&#39;;

    $link = mysql_connect($DbHost, $DbUser, $DbPwd) or die(&#39;数据库连接失败: &#39; . mysql_error());
    mysql_select_db($DbName) or die(&#39;数据库连接失败: &#39; . mysql_error());
    mysql_query(&#39;set names utf8&#39;);
    
    // 声明变量
    $isDropInfo   = &#39;&#39;;
    $insertSQL   = &#39;&#39;;
    $row      = array();
    $tables     = array();
    $tableStructure = array();
    $fileName    = ($saveFileName ? $saveFileName : &#39;MySQL_data_bakeup_&#39;) . date(&#39;YmdHis&#39;) . &#39;.sql&#39;;

    // 枚举该数据库所有的表
    $res = mysql_query("SHOW TABLES FROM $DbName");
    while ($row = mysql_fetch_row($res)) {

      $tables[] = $row[0];

    }
    mysql_free_result($res);

    // 枚举所有表的创建语句
    foreach ($tables as $val) {

      $res = mysql_query("show create table $val", $link);
      $row = mysql_fetch_row($res);

      $isDropInfo   = "DROP TABLE IF EXISTS `" . $val . "`;\r\n";
      $tableStructure = $isDropInfo . $row[1] . ";\r\n";

      file_put_contents($fileName, $tableStructure, FILE_APPEND);
      mysql_free_result($res);
    }

    // 枚举所有表的INSERT语句
    foreach ($tables as $val) {

      $res = mysql_query("select * from $val");

      // 没有数据的表不执行insert
      while ($row = mysql_fetch_row($res)) {

        $sqlStr = "INSERT INTO `".$val."` VALUES (";

        foreach($row as $v){

          $sqlStr .= "&#39;$v&#39;,";

        }
        //去掉最后一个逗号
        $sqlStr = substr($sqlStr, 0, strlen($sqlStr) - 1);
        $sqlStr .= ");\r\n";

        file_put_contents($fileName, $sqlStr, FILE_APPEND);
      }
      mysql_free_result($res);
    }

    echo &#39;数据备份成功！&#39;;
  }
　　 // 调用此方法 
  backupMySqlData(&#39;localhost&#39;, &#39;root&#39;, &#39;123456&#39;, &#39;YouDbName&#39;);  
?>