Home Backend Development PHP Tutorial 2.wp-blog-header.php文件分析(一)

2.wp-blog-header.php文件分析(一)

Jun 13, 2016 pm 01:09 PM
config header php wp

二.wp-blog-header.php文件分析(一)
前一章我们知道,index文件只做了声明一个确认加载的常量,之后就是包含wp-blog-header文件

//wp-blog-header.php所有内容
<?php

if ( !isset($wp_did_header) ) {

         //确认访问header
         	$wp_did_header = true; 
   
         //"./wp-load.php"
         	require_once( dirname(__FILE__) . '/wp-load.php' );

	wp();
         
         //"./wp-include/template-loder.php"
	require_once( ABSPATH . WPINC . '/template-loader.php' );

}

?>
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由上面代码我们可以把wp-blog-header.php分为三部分。
1.加载当前目录下的wp-load.php文件
2.调用wp()函数
3.加载wp-include目录下的template-loder.php文件

我们逐步分析,先从wp-load.php开始,这个文件也非常简单,上来设置根目录和错误报告的方式,再然后就是包含wp-config.php这个文件了。


define( 'ABSPATH', dirname(__FILE__) . '/' );    //wordpress根目录

//看根目录下的wp-config.php文件存在否,在就包含,没再就会对去掉根目录常量中的'/'并重新包含,再找不到可就进入安装页面了。
if ( file_exists( ABSPATH . 'wp-config.php') ) {

      require_once( ABSPATH . 'wp-config.php' );

} elseif ( file_exists( dirname(ABSPATH) . '/wp-config.php' ) && ! file_exists( dirname(ABSPATH) . '/wp-settings.php' ) ) {

      require_once( dirname(ABSPATH) . '/wp-config.php' );

} else {
        //安装代码,由于不研究安装,暂不写了
}
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我们这里默认已经安装了wordpress,所以程序应顺利加载了wp-config.php这个文件了,这文件里是数据库的配置信息和身份密钥,再有就是丫又加载了wp-include目录下的wp-setting.php文件。

//数据库信息和身份密钥就略过了
//看吧,明明在wp-load.php文件下定义了根目录常量了,这里由于要加载wp-settings.php又做了次判断,以确保意外发生,我们要学习这种严谨的编程习惯。
if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

/** 设置 WordPress 变量和包含文件。 */
require_once(ABSPATH . 'wp-settings.php');
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