分享PHP备份MYSQL数据的两种方法

通常情况下，我们都是使用工具备份，比如phpmyadmin、navicat。如果需要使用PHP备份，如何实现呢

下面提供两种方法，仅供研究使用。

第1种方法：

代码如下:

<?php
$host="localhost";
$user="root";
$password="";
$dbname="dbname";
mysql_connect($host,$user,$password);
mysql_select_db($dbname);
$mysql= "set names utf8;";
mysql_query($mysql);
$q1=mysql_query("show tables");
while($t=mysql_fetch_array($q1)){
$table=$t[0];
$q2=mysql_query("show create table `$table`");
$sql=mysql_fetch_array($q2);
$mysql.=$sql[&#39;Create Table&#39;].";\n";
$q3=mysql_query("select * from `$table`");
while($data=mysql_fetch_assoc($q3)){
$keys=array_keys($data);
$keys=array_map(&#39;addslashes&#39;,$keys);
$keys=join(&#39;`,`&#39;,$keys);
$keys="`".$keys."`";
$vals=array_values($data);
$vals=array_map(&#39;addslashes&#39;,$vals);
$vals=join("&#39;,&#39;",$vals);
$vals="&#39;".$vals."&#39;";
$mysql.="insert into `$table`($keys) values($vals);\n";
}
$mysql.="\n";
}
$filename=$dbname.date(&#39;Ymj&#39;).".sql";
$fp = fopen($filename,&#39;w&#39;);
fputs($fp,$mysql);
fclose($fp);
echo "数据备份成功,生成备份文件".$filename;
?>

第2种方法：

代码如下:

<?php
$host="localhost";
$user="root";
$password="";
$dbname="dbname";
backup_tables($host,$user,$password,$dbname);
/* backup the db OR just a table */
function backup_tables($host,$user,$pass,$name,$tables = &#39;*&#39;)
{
  $link = mysql_connect($host,$user,$pass);
  mysql_select_db($name,$link);
  //get all of the tables
  if($tables == &#39;*&#39;)
  {
    $tables = array();
    $result = mysql_query(&#39;SHOW TABLES&#39;);
    while($row = mysql_fetch_row($result))
    {
      $tables[] = $row[0];
    }
  }
  else
  {
    $tables = is_array($tables) ? $tables : explode(&#39;,&#39;,$tables);
  }
  $return = &#39;&#39;;
  //cycle through
  foreach($tables as $table)
  {
    $result = mysql_query(&#39;SELECT * FROM &#39;.$table);
    $num_fields = mysql_num_fields($result);    
    $return.= &#39;DROP TABLE &#39;.$table.&#39;;&#39;;
    $row2 = mysql_fetch_row(mysql_query(&#39;SHOW CREATE TABLE &#39;.$table));
    $return.= "\n\n".$row2[1].";\n\n";

    for ($i = 0; $i < $num_fields; $i++) 
    {
      while($row = mysql_fetch_row($result))
      {
        $return.= &#39;INSERT INTO &#39;.$table.&#39; VALUES(&#39;;
        for($j=0; $j<$num_fields; $j++) 
        {
          $row[$j] = addslashes($row[$j]);
          $row[$j] = ereg_replace("\n","\\n",$row[$j]);
          if (isset($row[$j])) { $return.= &#39;"&#39;.$row[$j].&#39;"&#39; ; } else { $return.= &#39;""&#39;; }
          if ($j<($num_fields-1)) { $return.= &#39;,&#39;; }
        }
        $return.= ");\n";
      }
    }
    $return.="\n\n\n";
  }

  //save file
  $handle = fopen(&#39;db-backup-&#39;.time().&#39;-&#39;.(md5(implode(&#39;,&#39;,$tables))).&#39;.sql&#39;,&#39;w+&#39;);
  fwrite($handle,$return);
  fclose($handle);
}
?>

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