PHP使用外部命令导出数据库，备份到服务器并下载到本地

<span><span>php

    </span><span>//</span><span> $dumpFileName目录要有可写权限</span>
    <span>$DbHost</span> = 'localhost'<span>;
　　</span><span>$DbUser</span>  = 'root'<span>;
　　</span><span>$DbPwd</span>   = '123456'<span>;
　　</span><span>$DbName</span>  = 'a'<span>;
   </span><span>$fileName</span> = <span>$DbName</span> . '_MySQL_data_backup_' . <span>date</span>('YmdHis) . '.sql'<span>;
　　$dumpFileName= "/var/$fileName";


　　header("Content-Disposition: attachment; filename=" . $fileName);
　　header("Content-type: application/octet-stream");
　　header("Pragma:no-cache"); 
　　header("Expires:0");
    
　　echo `mysqldump -h $DbHost -u$DbUser -p$DbPwd $DbName > $dumpFileName`;
    
　　$hd = fopen($dumpFileName, </span>'rb'<span>);
　　echo fread($hd, filesize($dumpFileName));
　　fclose($hd);    
 
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