CI フレームワークのソースコード閲覧メモ 6 拡張フック Hook.php、cihook.php_PHP チュートリアル

if ( ! is_array($data))
{
	return FALSE;
}

if ($this->in_progress == TRUE)
{
	return;
}

<span>$hook</span>['xx'] = <span>array</span><span>(
    </span>'class'     => 'xx', <span>//</span><span>钩子调用的类名，可以为空</span>
    'function'  => 'xx',<span>//</span><span>钩子调用的函数名</span>
    'filename'  => 'xx',<span>//</span><span>该钩子的文件名</span>
    'filepath'   => 'xx',<span>//</span><span>钩子的目录</span>
    'params'   => 'xx'<span>//</span><span>传递给钩子的参数</span>
);

if ( ! isset($data['filepath']) OR ! isset($data['filename']))
{
	return FALSE;
}

$filepath = APPPATH.$data['filepath'].'/'.$data['filename'];

if ( ! file_exists($filepath))
{
	return FALSE;
}

$class		= FALSE;
$function	= FALSE;
$params		= '';

/* 获取 hook class */
if (isset($data['class']) AND $data['class'] != '')
{
	$class = $data['class'];
}

/* 获取 hook function */
if (isset($data['function']))
{
	$function = $data['function'];
}

/* 获取传递的 hook 参数 */
if (isset($data['params']))
{
	$params = $data['params'];
}

/* 如果class和function都不存在，则无法定位hook程序，直接返回 */
if ($class === FALSE AND $function === FALSE)
{
	return FALSE;
}

/* 面向对象的设置方式 */
if ($class !== FALSE)
{
	if ( ! class_exists($class))
	{
		require($filepath);
	}

	$HOOK = new $class;
	$HOOK->$function($params);
}
/*  过程式的执行方式 */
else
{
	if ( ! function_exists($function))
	{
		require($filepath);
	}

	$function($params);
}

$this->in_progress = FALSE;
return TRUE;

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class CI_Hooks {

	/**
	 * Determines wether hooks are enabled
	 *
	 * @var bool
	 */
	var $enabled		= FALSE;
	/**
	 * List of all hooks set in config/hooks.php
	 *
	 */
	var $hooks			= array();
	/**
	 * Determines wether hook is in progress, used to prevent infinte loops
	 *
	 */
	var $in_progress	= FALSE;

	/**
	 * Constructor
	 */
	function __construct()
	{
		$this->_initialize();
		log_message('debug', "Hooks Class Initialized");
	}

	/**
	 * Initialize the Hooks Preferences
	 *
	 * @access	private
	 * @return	void
	 */
	function _initialize()
	{
		$CFG =& load_class('Config', 'core');

		// If hooks are not enabled in the config file
		// there is nothing else to do

		if ($CFG->item('enable_hooks') == FALSE)
		{
			return;
		}

		if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/hooks.php'))
		{
		    include(APPPATH.'config/'.ENVIRONMENT.'/hooks.php');
		}
		elseif (is_file(APPPATH.'config/hooks.php'))
		{
			include(APPPATH.'config/hooks.php');
		}

		if ( ! isset($hook) OR ! is_array($hook))
		{
			return;
		}

		$this->hooks =& $hook;
		$this->enabled = TRUE;
	}

	/**
	 * Call Hook
	 *
	 * Calls a particular hook
	 *
	 * @access	private
	 * @param	string	the hook name
	 * @return	mixed
	 */
	function _call_hook($which = '')
	{
		if ( ! $this->enabled OR ! isset($this->hooks[$which]))
		{
			return FALSE;
		}

		if (isset($this->hooks[$which][0]) AND is_array($this->hooks[$which][0]))
		{
			foreach ($this->hooks[$which] as $val)
			{
				$this->_run_hook($val);
			}
		}
		else
		{
			$this->_run_hook($this->hooks[$which]);
		}

		return TRUE;
	}

	/**
	 * Run Hook
	 *
	 * Runs a particular hook
	 *
	 * @access	private
	 * @param	array	the hook details
	 * @return	bool
	 */
	function _run_hook($data)
	{
		if ( ! is_array($data))
		{
			return FALSE;
		}

		// If the script being called happens to have the same hook call within it a loop can happen

		if ($this->in_progress == TRUE)
		{
			return;
		}

		if ( ! isset($data['filepath']) OR ! isset($data['filename']))
		{
			return FALSE;
		}

		$filepath = APPPATH.$data['filepath'].'/'.$data['filename'];

		if ( ! file_exists($filepath))
		{
			return FALSE;
		}


		$class		= FALSE;
		$function	= FALSE;
		$params		= '';

		if (isset($data['class']) AND $data['class'] != '')
		{
			$class = $data['class'];
		}

		if (isset($data['function']))
		{
			$function = $data['function'];
		}

		if (isset($data['params']))
		{
			$params = $data['params'];
		}

		if ($class === FALSE AND $function === FALSE)
		{
			return FALSE;
		}

		$this->in_progress = TRUE;

		// Call the requested class and/or function
		if ($class !== FALSE)
		{
			if ( ! class_exists($class))
			{
				require($filepath);
			}

			$HOOK = new $class;
			$HOOK->$function($params);
		}
		else
		{
			if ( ! function_exists($function))
			{
				require($filepath);
			}

			$function($params);
		}

		$this->in_progress = FALSE;
		return TRUE;
	}

}