mysqli 增强-批量执行sql 语句
<?php //mysqli 增强-批量执行sql 语句 //批量执行dql //使用mysqli的mysqli::multi_query() 一次性添加3个用户 $mysqli =new MySQLi("localhost","root","root","test"); if($mysqli->connect_error){ die ("连接失败".$mysqli->connect_error); } //注意分号 $sqls="insert into user1 (name,password,email,age) values('AAA',md5('AAA'),'AAA@hu.com',25);"; $sqls.="insert into user1 (name,password,email,age) values('BBB',md5('BBB'),'BBB@hu.com',25);"; $sqls.="insert into user1 (name,password,email,age) values('CCC',md5('CCC'),'CCC@hu.com',25);"; //批量执行dml 可以混合使用delete insert update 最好不要使用select //$sqls.="update user1 set age=15 where id=1;"; //$sqls.="delete from user1 where id=10"; $res=$mysqli->multi_query($sqls); if(!$res){ echo "操作失败".$mysqli->error; }else{ echo "OK"; }?>
2、批量查询
<?php //使用mysqli的mysqli::multi_query() 一次性查询表的机构和表中的内容 //1、创建mysqli对象 $mysqli=new MySQLi("localhost","root","root","test"); if($mysqli->connect_error){ die("连接失败".$mysqli->connect_error); } //2、批量查询语句 $sqls="select *from user1;"; $sqls.="desc user1"; //3、处理结果 //如果成功,至少有一个结果集 if($res=$mysqli->multi_query($sqls)){ do{ //取出第一个结果集 $res=$mysqli->store_result(); while($row=$res->fetch_row()){ foreach($row as $val){ echo '--'.$val; } echo '<br/>'; } //及时释放内存 $res->free(); //判断是否还有结果集 if($mysqli->more_results()){ echo "********新的结果集***************<br/>"; }else{ break; } }while($mysqli->next_result()); } //4、关闭资源 $mysqli->close();?>

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

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.


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