PHP and Ajax technology examples explained

This article explains PHP and Ajax technology examples.

PHP and Ajax technology

(1) What is Ajax

That is, Asynchronous JavaScript And XML, asynchronous JavaScript and XML technology.

It is a combination of various existing technologies that can implement asynchronous request operations on the client.

This allows communication with the server without refreshing the page, thereby reducing the user's waiting time. time.

(2)Ajax development model

Explanation: This is to help understand the principle of ajax's asynchronous implementation.

(3) Technology used by ajax.

JavaScript scripting language

XMLHttpRequest

It is a JavaScript object with an application program interface that can connect to the server using HTTP.

XML language

It provides a format for describing structured data.

The data exchanged between the XMLHttpRequest object and the server is usually in XML format.

DOM

In Ajax applications, DOM is manipulated through JavaScript to achieve asynchronous effects.

CSS

(4) Question.

There are several issues that should be paid attention to in Ajax development, the most important of which is the Chinese encoding issue.

Two situations:

PHP sends Chinese and Ajax receives.

Just add header('Content-type: text/html; charset=GB2312');

Ajax sends Chinese and PHP receives it.

First use the iconv function to convert the Chinese to be submitted.

$GB2312string = iconv ('UTF-8', 'gb2312//IGNORE', $RequestAjaxString);

Then use the above header statement in php to convert back to GB2312.

$RequestAjaxString represents the data to be submitted in Ajax. (Seems to be a constant, to be studied)

Explanation: Ajax uses UTF-8 encoding by default. However, Chinese in php is not garbled and needs to be encoded in GB2312.

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