php 备份数据库 Backup Your MySQL Database Using PHP

代码：

<?php

backup_tables('localhost','root','root','mysql');

/* backup the db OR just a table */
function backup_tables($host,$user,$pass,$name,$tables = '*')
{
	
	$link = mysql_connect($host,$user,$pass);
	mysql_select_db($name,$link);
	
	$return  = "-- \n";
    $return .= '-- MySQL DATABASE DUMPER. Copyright GLS Studio ' . "\n";
    $return .= "-- \n\n";
		
	//get all of the tables
	if($tables == '*')
	{
		$tables  = array();
		$result = mysql_query('SHOW TABLES');
		while($row = mysql_fetch_row($result)) $tables[] = $row[0];
	}
	else $tables = is_array($tables) ? $tables : explode(',',$tables);
	
	//cycle through
	foreach($tables as $table)
	{
		$result = mysql_query('SELECT * FROM '.$table);
		$num_fields = mysql_num_fields($result);
		
		$return     .= "-- ------------------------------------------------ \n";
        $return     .= "-- Table structure for table `{$table}` \n\n";

		// Dump Structure
        $return     .= "DROP TABLE IF EXISTS `{$table}`; \n";
		$row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
		$return.= "\n\n".$row2[1].";\n";
		
		for ($i = 0; $i < $num_fields; $i++) 
		{
			while($row = mysql_fetch_row($result))
			{
				$return.= 'INSERT INTO '.$table.' VALUES(';
				for($j=0; $j<$num_fields; $j++) 
				{
					$row[$j] = addslashes($row[$j]);
					$row[$j] = ereg_replace("\n","\\n",$row[$j]);
					
					if (isset($row[$j])) $return .= '"'.$row[$j].'"' ;
					else $return .= '""';
					
					if ($j<($num_fields-1)) $return.= ','; 
				}
				$return.= ");\n";
			}
		}
		$return .="\n\n";
        $return .= "-- Table structure for table `{$table}` \n";
        $return .= "-- ------------------------------------------------- \n\n\n";
	}
	
	//save file
	//$handle = fopen('db-backup-'.time().'-'.(md5(implode(',',$tables))).'.sql','w+');
	//fwrite($handle,$return);
	//fclose($handle);
	
	//add below code to download it as a sql file
	Header('Content-type: application/octet-stream');
	Header('Content-Disposition: attachment; filename=db-backup-'.time().'-'.(md5(implode(',',$tables))).'.sql');
	echo $return;
}