有時(shí)候，你的用戶要求添加一個(gè)選項(xiàng)，導(dǎo)出整個(gè)數(shù)據(jù)庫(kù)到一個(gè)SQL文件。雖然phpMyAdmin，以及Navicat有這個(gè)功能，但你的用戶想要更簡(jiǎn)單點(diǎn)怎么辦？

以下是如何一鍵導(dǎo)出MySQL數(shù)據(jù)庫(kù)的php代碼。

新建一個(gè)名為backup.php的文件，復(fù)制粘貼以下代碼，然后編輯數(shù)據(jù)庫(kù)連接設(shè)置和mysqldump的路徑。有必要的話，你還可以添加一個(gè)backup.php超鏈接到你的程序里：

<A href="backup.php">導(dǎo)出整個(gè)數(shù)據(jù)庫(kù)</A>

請(qǐng)注意，第一個(gè)php代碼執(zhí)行的時(shí)候，會(huì)導(dǎo)出zip壓縮后的sql文件，所以此代碼所在文件夾需要可寫的權(quán)限。
如果你沒(méi)有寫的權(quán)限，請(qǐng)使用第二個(gè)php代碼，缺點(diǎn)是導(dǎo)出的sql文件不會(huì)被zip壓縮。

此代碼需要可寫權(quán)限：

<?php
 
$username = "root"; 
$password = ""; 
$hostname = "localhost"; 
$dbname   = "cars";
 
// if mysqldump is on the system path you do not need to specify the full path
// simply use "mysqldump --add-drop-table ..." in this case
$dumpfname = $dbname . "_" . date("Y-m-d_H-i-s").".sql";
$command = "C:\\xampp\\mysql\\bin\\mysqldump --add-drop-table --host=$hostname
    --user=$username ";
if ($password) 
        $command.= "--password=". $password ." "; 
$command.= $dbname;
$command.= " > " . $dumpfname;
system($command);
 
// zip the dump file
$zipfname = $dbname . "_" . date("Y-m-d_H-i-s").".zip";
$zip = new ZipArchive();
if($zip->open($zipfname,ZIPARCHIVE::CREATE)) 
{
   $zip->addFile($dumpfname,$dumpfname);
   $zip->close();
}
 
// read zip file and send it to standard output
if (file_exists($zipfname)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($zipfname));
    flush();
    readfile($zipfname);
    exit;
}
?>

此代碼不需要可寫權(quán)限：

<?php
ob_start();
 
$username = "root"; 
$password = ""; 
$hostname = "localhost"; 
$dbname   = "cars";
 
// if mysqldump is on the system path you do not need to specify the full path
// simply use "mysqldump --add-drop-table ..." in this case
$command = "C:\\xampp\\mysql\\bin\\mysqldump --add-drop-table --host=$hostname
    --user=$username ";
if ($password) 
        $command.= "--password=". $password ." "; 
$command.= $dbname;
system($command);
 
$dump = ob_get_contents(); 
ob_end_clean();
 
// send dump file to the output
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($dbname . "_" . 
    date("Y-m-d_H-i-s").".sql"));
flush();
echo $dump;
exit();]]>
?>

原文：http://webcheatsheet.com/php/how_to_create_a_dump_of_mysql_database_in_one_click.php