PHP中__FILE__、dirname与basename用法实例分析
这篇文章主要介绍了PHP中__FILE__、dirname与basename用法,以实例形式较为详细的分析了__FILE__、dirname与basename的具体用法,并测试对比了WordPress中自带的函
本文实例讲述了PHP中__FILE__、dirname与basename用法。分享给大家供大家参考。具体方法如下:
在php中__FILE__当前运行文件的完整路径和文件名,如果用在被包含文件中,则返回被包含的文件名,这是一个魔法变量(预定义常量),我们可以通用dirname与basename来获取文件目录或文件名.
一、__FILE__与dirname(__FILE__)与basename(__FILE__)使用:
通常在配置文件路径的时候用dirname(__FILE__)是非常有效的方法,但是因为__FILE__的路径是当前代码所在文件(而不是url所在文件)完整路径,所以定义配置文件通常要放在根目录下定义网站的根地址,但是下面的方法可以解决配置文件的存放问题,代码如下:
复制代码 代码如下:
dirname(dirname(__FILE__));
假设__FILE__为 /home/web/config/config.php,上面的方法输出为 /home/web
dirname(dirname(__FILE__));得到的是文件上一层目录名
dirname(__FILE__);得到的是文件所在层目录名
假设现在的目录及文件结构如下,我们所要测试的变量在wp_smtp_admin.php文件中:
wp-content\plugins\wp-smtp\wp-smtp.php
wp-content\plugins\wp-smtp\wp_smtp_admin.php
wp-content\plugins\wp-smtp\img\blq_32_32.jpg
测试结果如下,代码如下:
复制代码 代码如下:
echo __FILE__ . "
"; //输出 F:\xampp\htdocs\wordpress\wp-content\plugins\wp-smtp\wp_smtp_admin.php
echo dirname(__FILE__) . "
"; //输出 F:\xampp\htdocs\wordpress\wp-content\plugins\wp-smtp
echo basename(__FILE__) . "
"; //输出 wp_smtp_admin.php
二、测试wordpress自带的一些函数:
复制代码 代码如下:
echo plugin_basename(__FILE__) . "
"; //输出wp-smtp/wp_smtp_admin.php
echo dirname(plugin_basename(__FILE__)) . "
"; //输出 wp-smtp
echo plugin_dir_url(__FILE__) . "
"; //输出
echo plugin_dir_path(__FILE__) . "
"; //输出 F:\xampp\htdocs\wordpress\wp-content\plugins\wp-smtp/
echo plugins_url() . "
"; //输出
echo plugins_url('',__FILE__) . "
"; //输出
echo plugins_url('/img/blq_32_32.jpg',__FILE__) . "
"; //输出
好了现在我们来看看这dirname与basename相关说明
dirname() 函数返回路径中的目录部分,basename() 函数返回路径中的文件名部分,从这里我们就不难看出上面的结果了.
希望本文所述对大家的PHP程序设计有所帮助。
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