Ajax
/path/to/pkphp.com/script.php?ajax在php脚本中使用如下方法判断:
复制代码 代码如下:
if(isset($_GET['ajax'])) {
...这是一个ajax请求,然后...
}
else {
...这不是一个ajax请求,然后...
}
通过传递_GET参数的方法简单实现了网页请求的判断。但是如果需要这样的功能,这个方法可能就有弊端,功能需求如下:
1.通过ajax请求的网页与普通请求的网页内容是不相同的
2.通过ajax请求的网页是为了方便用户操作,两种方法请求打开的网页必须的内容是相同的,只是ajax请求到的网页内容比较简化和使用,去除了网页的大框架模板。
3.这么做的目的是:用户在网页操作时通过ajax实现,而搜索引擎访问网页时(相当于普通打开网页),得到的内容是一个完整的网页(包含了网页的大框架模板)。
要完成上面的这个功能,就不能使用前面介绍的通过GET参数传递来判断了,如果使用GET传递来判断的话,用户ajax请求和普通网页请求都会是一样的内容,因为你不可能为一个链接设置一个带ajax判断参数和不带的URL。那么如何才能实现这个功能呢?必须通过服务器端PHP判断解决这个问题。也就是今天要说的PHP如何判断ajax请求。这个问题要解决有一个先决条件,那就是你使用的ajax框架必须是jquery。在jquery框架中,对于通过它的$.ajax, $.get, or $.post方法请求网页内容时,它会向服务器传递一个HTTP_X_REQUESTED_WITH的参数,你可以利用如下方法判断某个请求是ajax请求还是普通请求:
if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')
{
..这是一个ajax请求,然后...
}
else {
..这不是一个ajax请求,然后...
}
if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH
{
...这是一个ajax请求,然后...
}
else {
...这不是一个ajax请求,然后...
}
利用这个来进行判断操作,可以使网页端的URL保持一致,但是能够对两种不同的请求却能够得到不同内容的网页。即实现了用户操作优化,又不影响搜索引擎收录,我觉得是一个很棒的解决方案!
这里有一个另外需要注意的问题,就是如果你的jquery请求是通过iframe打开网页的,那么HTTP_X_REQUESTED_WITH参数不会被传递,也就是说你没有办法判断请求的类型。
主要内容是:
1.
这个问题要解决有一个先决条件,那就是你使用的ajax框架必须是jquery。在jquery框架中,对于通过它的$.ajax, $.get, or $.post方法请求网页内容时,它会向服务器传递一个HTTP_X_REQUESTED_WITH的参数,你可以利用如下方法判断某个请求是ajax请求还是普通请求:
if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')
{
2.
这里有一个另外需要注意的问题,就是如果你的jquery请求是通过iframe打开网页的,那么HTTP_X_REQUESTED_WITH参数不会被传递,也就是说你没有办法判断请求的类型。

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.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 English version
Recommended: Win version, supports code prompts!

Notepad++7.3.1
Easy-to-use and free code editor

Atom editor mac version download
The most popular open source editor