如何实现PHP自动备份数据库

mysqldump -u username -p dbname table1 table2 ...  > BackupName.sql

/**
 * [copyDb description]  备份数据库
 * @param  [type] $dbname   [description]  数据库名
 * @param  [type] $fileName [description]  存储的文件名
 * @return [type]           [description]
 */public function copyDb($dbname, $fileName){
	$myfile = fopen($fileName, "w") or die("Unable to open file!");//打开存储文件
	$this->link->query("use {$dbname}");//切换数据库
	$this->changeDb($dbname);
	$tables = $this->link->query('show tables');//获取当期数据库所有表名称
	while($re = $tables->fetch(PDO::FETCH_ASSOC)){
		//var_dump($re);//查看数组构成
		$tableName = $re['Tables_in_'.$dbname];//构成特定的下标
		$sql = "show create table {$tableName};";
		$tableSql = $this->link->query($sql);

		fwrite($myfile, "DROP TABLE IF EXISTS `{$tableName}`;\r\n");//加入默认删除表的遇见
		//下面备份表结构，这个循环之执行一次
		while($re = $tableSql->fetch(PDO::FETCH_ASSOC)){
			// echo "<pre class="brush:php;toolbar:false">";
			// var_dump($re);
			// echo "

"; echo "正在备份表{$re['Table']}结构
"; fwrite($myfile, $re['Create Table'].";\r\n\r\n"); echo "正在备份表{$re['Table']}结构完成
"; } //下面备份表数据 echo "正在备份表{$tableName}数据
"; $sql = "select * from {$tableName};"; $valueSql = $this->link->query($sql); while($re = $valueSql->fetch(PDO::FETCH_ASSOC)){ $keyArr = array_keys($re);//获得对应的键值 $valueArr = array_values($re);//获得对应的值 $keyStr = ''; foreach ($keyArr as $key => $value) { $keyStr .= "`".$value."`,"; } $keyStr = substr($keyStr,0,strlen($keyStr)-1); //取出最后一个逗号 $valueStr = ''; // var_dump($valueArr); foreach ($valueArr as $key => $value) { $valueStr .= "'".$value."',"; } //以上的处理只是对应sql的写法 $valueStr = substr($valueStr,0,strlen($valueStr)-1); //取出最后一个逗号 $sql = "insert into `{$tableName}`({$keyStr}) values({$valueStr})"; fwrite($myfile, $sql.";\r\n\r\n"); } echo "正在备份表{$tableName}数据完成
"; echo "

---

"; } fclose($myfile);}