php数据库备份脚本

<?php
// 备份数据库
$host = "localhost" ;
$user = "root" ; //数据库账号
$password = "" ; //数据库密码
$dbname = "mysql" ; //数据库名称
// 这里的账号、密码、名称都是从页面传过来的
if (!mysql_connect( $host , $user , $password )) // 连接mysql数据库
    {
        echo '数据库连接失败，请核对后再试' ;
    exit ;
}
if (!mysql_select_db( $dbname )) // 是否存在该数据库
    {
        echo '不存在数据库:' . $dbname . ',请核对后再试' ;
    exit ;
}
mysql_query( "set names 'utf8'" );
$mysql = "set charset utf8;\r\n" ;
$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 [ 'Create Table' ] . ";\r\n" ;
    $q3 = mysql_query( "select * from `$table`" );
    while ( $data = mysql_fetch_assoc( $q3 ))
    {
        $keys = array_keys ( $data );
        $keys = array_map ( 'addslashes' , $keys );
        $keys = join( '`,`' , $keys );
        $keys = "`" . $keys . "`" ;
        $vals = array_values ( $data );
        $vals = array_map ( 'addslashes' , $vals );
        $vals = join( "','" , $vals );
        $vals = "'" . $vals . "'" ;
        $mysql .= "insert into `$table`($keys) values($vals);\r\n" ;
    }
}

$filename = $dbname . date ( 'Ymjgi' ) . ".sql" ; //存放路径，默认存放到项目最外层
$fp = fopen ( $filename , 'w' );
fputs ( $fp , $mysql );
fclose( $fp );
echo "数据备份成功" ;

?>