php程序备份还原mysql数据库

<?php
$link = mysql_connect("localhost", "root","");
mysql_query("set names utf8");

// mysql_select_db('数据库名称', $link);

$version = mysql_get_server_info($link);

$sys_info['os'] = PHP_OS;
$sys_info['php_ver'] = PHP_VERSION;
$sys_info['date'] = date('Y-m-d H:i:s', time());
// 头文件
$head = "-- lin3615 SQL Dump Program
".
                "-- " . $sys_info['os'] . "
".
                "-- PHP VERSION : " . $sys_info['php_ver'] . "
";
                "-- MYSQL VERSION : " . $version . "
";
                "-- Date " . $sys_info['date'] . "
";
// 写入文件中        
$fileName = date('Y-m-d-H-i-s', time()) . ".sql";
$str = $head;    
//获取数据表列表    
$tableSQL = "show  tables";
$tableNameArr = array(); // 数据表名称列表 
$res = mysql_query($tableSQL, $link);
while($row = mysql_fetch_assoc($res))
{
    $tableNameArr[] = $row['Tables_in_数据库名']; // Tables_in_数据库名称
}
foreach($tableNameArr as $table)
{
    // 获取数据表定义
    $tableDefineSQL = "show create table " . $table;
    $resTableDefine = mysql_query($tableDefineSQL, $link);
    $res = mysql_fetch_assoc($resTableDefine);
    $tableDataDefine = $res['Create Table'] . ";
";     // 数据表定义
    $str = $str . $tableDataDefine;
    $str = $str. "-- --------------------
";
    $str = $str. "-- Records of ".$table."
";
    $str = $str. "-- --------------------
";
    
    // 获取数据表的数据
    $sql = "select * from " . $table;
    $res = mysql_query($sql, $link);
    while($row = mysql_fetch_assoc($res))
    {
        $keysArray = $row;
        $record = array_map("mysql_real_escape_string",$row); // 处理换行符，转义字符
        $rr = implode("','", $record);
        $keyRecord = array_keys($keysArray);
        $ss = implode('`,`', $keyRecord);
        $fields = "`" . $ss . "`";
        $sql = "insert into `".$table."` (".$fields.") values ('" . $rr . "');
";
        $str = $str . $sql;
    }
}    
$resultEnd = file_put_contents($fileName, $str);

// 以上结束数据备份

// 以下开始数据还原操作
$arr = file('备份数据库名.sql');
// 移除注释
function remove_comment($arr)
{
    return (substr($arr, 0,2) != '--');
}
$sql_str = array_filter($arr,'remove_comment');
$sql_str = str_replace("
", "",implode('',$sql_str));
$ret = explode(";
", $sql_str);
foreach($ret as $val)
{
    $val = trim($val, " 
;");
    mysql_query($val, $link);
}