How to implement plug-in function in php
php实现插件功能:1、新建函数文件“function.php”,代码内容是“function addAction($hook, $actionFunc){...}”;2、确认插件的Hook点,设置钩子埋入点;3、建立“check_all.php”和“login.php”两个文件,然后在“check_all.php”文件中写入“addAction(...)”即可。
本教程操作环境:Windows7系统、PHP8.1版、Dell G3电脑。
php怎么实现插件功能?
php实现插件
插件很多从事互联网行业或者开发的人员来不是很陌生,wordpress之所以为什么那么受欢迎,很大部分是因为他的强大的插件库,还要譬如就是大家熟知的jquery,他的插件丰富的让人难以想象。一个开源产品想要获得很好的用户首先要具有搞扩展性,插件就是一种。插件,亦即Plug-in,是指一类特定的功能模块(通常由第三方开发者实现)。
它的特点是:当你需要它的时候激活它,不需要它的时候禁用/删除它;且无论是激活还是禁用都不影响系统核心模块的运行,也就是说插件是一种非侵入式的模块化设计,实现了核心程序与插件程序的松散耦合。
在php的插件中,很大一部分的插件都与一个叫:call_user_func_array的php函数有很大的关系,
当然php的插件机制的实现不仅仅是这一种方法。关于此函数的运用,请去看手册吧。
一个插件需要三个条件:
1、插件的支持函数,进行插件的功能实现
2、插件的Hook点,我们称为钩子埋入点,就是在什么地方这个插件要执行。
3、插件的位置
第一步:支持函数:
我们新建函数文件function.php,代码如下:
<?php /* * 在插件列表中要添加的插件名 * @ pragma string $hook 插件列表名 * @ pragma string $actionFunc 插件名 */ function addAction($hook, $actionFunc){ global $emHooks; if (!@in_array($actionFunc, $emHooks[$hook])){ $emHooks[$hook][] = $actionFunc; } return true; } /** * 插件钩子的执行函数。也就是所谓的钩子的埋入点函数 * @param string $hook 插件列表名 */ function doAction($hook){ global $emHooks; $args = array_slice(func_get_args(), 1);//获取其他参数 if (isset($emHooks[$hook])){ foreach ($emHooks[$hook] as $function){ $string = call_user_func_array($function, $args); } } }
第二步:设置钩子埋入点:
define("APP_ROOT",str_replace("\\","/",dirname(__FILE__))."/"); require("function.php"); //加载功能函数 /** * 加载插件路径 * 一般情况下,我们要先存储和判断插件是否激活, *你可以保存在数据库中,也可以保存在文件配置缓存中 */ function load_plugins_file($plugin) { //要判断和检查。 if(is_string($plugin) && preg_match("/^[\w\-\/]+$/", $plugin) && file_exists(APP_ROOT."plugins/".$plugin.".php")){ require APP_ROOT."plugins/".$plugin.".php"; } } //演示的插件例子 $pluginsName = array("check_all","login"); foreach($pluginsName as $plugin){ load_plugins_file($plugin); } //埋下的钩子 doAction("fbbin");
第三步:插件代码实现
我们按照上面定义的两个插件名字建立check_all.php和login.php两个文件,然后在check_all.php文件中写入:
<?php function check_all() { echo "<p>全部通过</p>"; } addAction("fbbin","check_all"); //像fbbin插件列表中添加插件,那么之后执行的doAction函数就能在全局变量中找到这个插件了,那么这样子,这个插件便会被执行。 ?>
同理在login.php文件中,可以写入相关的内容 然后在后面加上addAction(“fbbin”,”login”);那么login插件就会被执行了。
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