wordpress 学习第三篇

我们来看看wp-load.php的内容。

<?php/** * Bootstrap file for setting the ABSPATH constant * and loading the wp-config.php file. The wp-config.php * file will then load the wp-settings.php file, which * will then set up the WordPress environment. * * If the wp-config.php file is not found then an error * will be displayed asking the visitor to set up the * wp-config.php file. * * Will also search for wp-config.php in WordPress' parent * directory to allow the WordPress directory to remain * untouched. * * @package WordPress *//** Define ABSPATH as this files directory */define( 'ABSPATH', dirname(__FILE__) . '/' );if ( defined('E_RECOVERABLE_ERROR') )error_reporting(E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR);elseerror_reporting(E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING);if ( file_exists( ABSPATH . 'wp-config.php') ) {/** The config file resides in ABSPATH */require_once( ABSPATH . 'wp-config.php' );} elseif ( file_exists( dirname(ABSPATH) . '/wp-config.php' ) && ! file_exists( dirname(ABSPATH) . '/wp-settings.php' ) ) {/** The config file resides one level above ABSPATH but is not part of another install*/require_once( dirname(ABSPATH) . '/wp-config.php' );} else {// A config file doesn't exist// Set a path for the link to the installerif (strpos($_SERVER['PHP_SELF'], 'wp-admin') !== false) $path = '';else $path = 'wp-admin/';// Die with an error messagerequire_once( ABSPATH . '/wp-includes/classes.php' );require_once( ABSPATH . '/wp-includes/functions.php' );require_once( ABSPATH . '/wp-includes/plugin.php' );$text_direction = /*WP_I18N_TEXT_DIRECTION*/"ltr"/*/WP_I18N_TEXT_DIRECTION*/;wp_die(sprintf(/*WP_I18N_NO_CONFIG*/"There doesn't seem to be a <code>wp-config.php</code> file. I need this before we can get started. Need more help? <a href='http://codex.wordpress.org/Editing_wp-config.php'>We got it</a>. You can create a <code>wp-config.php</code> file through a web interface, but this doesn't work for all server setups. The safest way is to manually create the file.</p><p><a href='%ssetup-config.php' class='button'>Create a Configuration File</a>"/*/WP_I18N_NO_CONFIG*/, $path), /*WP_I18N_ERROR_TITLE*/"WordPress › Error"/*/WP_I18N_ERROR_TITLE*/, array('text_direction' => $text_direction));}?>

首先就定义了ABSPATH，非常的有意义。所以在wordpress的主题以及插件中，如果你获得wordpress根目录的话，就可以用ABSPATH。这就是预定义的好处。不用每一次都用dirname(__FILE__)，所以编写代码是非常有意思的事情，不要以为你能实现一个功能就可以了，关键要看可维护性以及科学性如何。是否最佳。

然后就是错误处理函数。编程中也要经常考虑到的事情。

下面仔细分析的话就知道是该载入wp-setting.php了。

如果没有发现wp-setting.php的话，会给出提示信息的。

file_exists( ABSPATH . 'wp-config.php') 和file_exists( dirname(ABSPATH) . '/wp-config.php' ) && ! file_exists( dirname(ABSPATH) . '/wp-settings.php' )这里是什么意思呢？

为什么要比较这个ABSPATH和dirname(ABSPATH) ？这个是非常精细的思考。这里面是有一些wordpress的技巧在里面,也就是可以把wp-config.php这个文件放到index.php这个文件的上层目录中去。笔者把wp-config.php从目录中删除，然后放到父目录上面，程序照常工作。下面的代码就是如果没有找到wp-config.php，wp给出的一个提示。因为这是wp安装程序的一部分。。。。

dirname()返回文件或者文件夹的父目录。

<?php    define( 'ABSPATH', dirname(__FILE__) . '/' );    echo ABSPATH;    echo "<br />";    echo dirname(ABSPATH);?>

简单的来测了一下。

结果如下：

G:\phpinstall\www\wp/
G:\phpinstall\www

斜杠在这可以不考虑，因为这是windows和linux的区别。