用php代码实现数据库备份可以使网站的管理变得非常便捷,我们可以直接进后台操作就能完成数据库的备份。
关键技术:
1. 首先要得到该数据库中有哪些表,所用函数 mysql_list_tables(),然后可以将获取的所有表名存到一个数组。
2. show create table 表名 可以获取表结构。
3. select * from 表名 取出所有记录,用循环拼接成 insert into... 语句。
实现代码:
header("Content-type:text/html;charset=utf-8");
//配置信息
$cfg_dbhost = 'localhost';
$cfg_dbname = 'ftdm';
$cfg_dbuser = 'root';
$cfg_dbpwd = 'root';
$cfg_db_language = 'utf8';
$to_file_name = "ftdm.sql";
// END 配置
//链接数据库
$link = mysql_connect($cfg_dbhost,$cfg_dbuser,$cfg_dbpwd);
mysql_select_db($cfg_dbname);
//选择编码
mysql_query("set names ".$cfg_db_language);
//数据库中有哪些表
$tables = mysql_list_tables($cfg_dbname);
//将这些表记录到一个数组
$tabList = array();
while($row = mysql_fetch_row($tables)){
$tabList[] = $row[0];
}
echo "运行中,请耐心等待...
";
$info = "-- ----------------------------\r\n";
$info .= "-- 日期:".date("Y-m-d H:i:s",time())."\r\n";
$info .= "-- 仅用于测试和学习,本程序不适合处理超大量数据\r\n";
$info .= "-- ----------------------------\r\n\r\n";
file_put_contents($to_file_name,$info,FILE_APPEND);
//将每个表的表结构导出到文件
foreach($tabList as $val){
$sql = "show create table ".$val;
$res = mysql_query($sql,$link);
$row = mysql_fetch_array($res);
$info = "-- ----------------------------\r\n";
$info .= "-- Table structure for `".$val."`\r\n";
$info .= "-- ----------------------------\r\n";
$info .= "DROP TABLE IF EXISTS `".$val."`;\r\n";
$sqlStr = $info.$row[1].";\r\n\r\n";
//追加到文件
file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
//释放资源
mysql_free_result($res);
}
//将每个表的数据导出到文件
foreach($tabList as $val){
$sql = "select * from ".$val;
$res = mysql_query($sql,$link);
//如果表中没有数据,则继续下一张表
if(mysql_num_rows($res) //
$info = "-- ----------------------------\r\n";
$info .= "-- Records for `".$val."`\r\n";
$info .= "-- ----------------------------\r\n";
file_put_contents($to_file_name,$info,FILE_APPEND);
//读取数据
while($row = mysql_fetch_row($res)){
$sqlStr = "INSERT INTO `".$val."` VALUES (";
foreach($row as $zd){
$sqlStr .= "'".$zd."', ";
}
//去掉最后一个逗号和空格
$sqlStr = substr($sqlStr,0,strlen($sqlStr)-2);
$sqlStr .= ");\r\n";
file_put_contents($to_file_name,$sqlStr,FILE_APPEND);
}
//释放资源
mysql_free_result($res);
file_put_contents($to_file_name,"\r\n",FILE_APPEND);
}
echo "OK!";
?>

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.

Fibers was introduced in PHP8.1, improving concurrent processing capabilities. 1) Fibers is a lightweight concurrency model similar to coroutines. 2) They allow developers to manually control the execution flow of tasks and are suitable for handling I/O-intensive tasks. 3) Using Fibers can write more efficient and responsive code.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.


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