How to write a plug-in in php

Written at the front

With the rapid development of the Internet and the popularity of lamp architecture, PHP supports more and more extensions, which directly promotes the development of PHP.

But PHP also has inevitable problems with scripting languages. Its performance is much different than compiled languages ​​such as C, so when considering performance issues, it is best to extend it through PHP to solve. (Recommended learning: PHP video tutorial)

So, how to make a php extension. Let's start with an example (requires C basic).

Solving a problem

In a system, if the sum of squares of an array is often required, we can write it like this.

<?php
    function array_square_sum($data){
        $sum = 0;
        foreach($data as $value){
            $sum += $value * $value;
        }
        return $sum;
    }

When actually executed, the php zend engine will translate this paragraph into C language, and memory allocation is required every time. So the performance is relatively poor. Furthermore, based on performance considerations, we can write an extension to do this.

Writing extensions

To build an extension, at least 2 files are required. One is the Configulator file, which tells the compiler which at least dependent libraries are required to compile this extension; the second is the actual execution file.

Generate framework

It sounds very complicated, but in fact there is a tool that can help us get an extended framework. There is a tool ext_skel in the PHP source code, which can help us generate an extension framework.

liujun@ubuntu:~/test/php-5.5.8/ext$ ls ext_skel
ext_skel

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