Ajax
php应用越来越多,也越来越广泛,为了增加网站的丰富多彩,从而出现了很多新的技术。ajax是现代网站中不能缺少的一项技术,他可以异步刷新数据,而实现很多效果,比如刷新验证码,微博中的赞功能,都是运用这个。
本次赞功能的效果图:
主页文件(index.php):
复制代码 代码如下:
header("Content-type:text/html;charset=utf-8");
include "finger_ajax.php";
$sql = "select * from finger_ajax";
$res = mysql_query($sql,$link);
while($row = mysql_fetch_array($res)){
echo "
".$row['title']." \r\n赞一下(".$row['finger'].")
}
?>
处理ajax请求及配置信息文件(finger_ajax.php):
复制代码 代码如下:
/**"赞" 功能 响应ajax请求*/
//配置
$dbHost = "localhost";
$dbUser = "root";
$dbPass = "dddddd";
$dbName = "test";
$dbCharset = "utf8";
$link = mysql_connect($dbHost,$dbUser,$dbPass) or die(mysql_error());
mysql_query("set names ".$dbCharset);
mysql_select_db($dbName);
// End
//接受对应的id
if(!empty($_POST['id'])){
$id = $_POST['id'];
//“赞”加1
$sql = "update finger_ajax set finger=finger+1 where id=$id;";
if(mysql_query($sql,$link)){
echo "ok";
}else{
echo "failed";
}
}
?>
js文件(finger_ajax.js):
复制代码 代码如下:
//赞 js
function finger(topic_id){
$.post("finger_ajax.php", { "id": topic_id },
function(data){
if(data=="ok"){
alert("感谢您的支持!");
}else{
alert("对不起,失败了!");
}
}, "text");
//获取当前“赞”的次数并加1
var finger = parseInt($(".finger"+topic_id).html())+1;
//更新“赞”的次数
$(".finger"+topic_id).html(finger);
}
数据库代码(finger_ajax.sql):
复制代码 代码如下:
DROP TABLE IF EXISTS `finger_ajax`;
CREATE TABLE `finger_ajax` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(50) NOT NULL DEFAULT '',
`finger` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of finger_ajax
-- ----------------------------
INSERT INTO `finger_ajax` VALUES ('1', '今天天气还不错哦!去做点什么好呢?', '10');
INSERT INTO `finger_ajax` VALUES ('2', '欢迎来到 www.bitsCN.com,国庆将至,祝大家国庆节快乐!!', '3');

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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