Analysis of _ FILE _, dirname, and basename usage examples in PHP

Source: Internet
Author: User
This article mainly introduces the usage of _ FILE _, dirname, and basename in PHP, and analyzes in detail the usage of _ FILE _, dirname, and basename in the form of an instance, test and compare the built-in function in WordPress

This article mainly introduces the usage of _ FILE _, dirname, and basename in PHP, and analyzes in detail the usage of _ FILE _, dirname, and basename in the form of an instance, test and compare the built-in function in WordPress

This example describes the usage of _ FILE _, dirname, and basename in PHP. Share it with you for your reference. The specific method is as follows:

In php, the complete path and FILE name of the current running FILE are _ FILE _. If it is used in the included FILE, the included FILE name is returned, this is a magic variable (a predefined constant). We can use dirname and basename to obtain the file directory or file name.

1. Use _ FILE _ and dirname (_ FILE _) and basename (_ FILE:

It is usually very effective to use dirname (_ FILE _) When configuring the FILE path, however, because the path of _ FILE _ is the complete path of the FILE where the current code is located (rather than the FILE where the url is located), the configuration FILE must be defined under the root directory to define the root address of the website, however, the following method can solve the problem of storing the configuration file:

The Code is as follows:

Dirname (_ FILE __));

Assume that _ FILE _ Is/home/web/config. php, and the above method output is/home/web

Dirname (_ FILE _); the directory name at the top of the FILE is obtained.

Dirname (_ FILE _); the directory name of the FILE's layer is obtained.

Assume that the current directory and file structure are as follows. The variables we want to test are in the wp_smtp_admin.php file:

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

The test result is as follows:

The Code is as follows:

Echo _ FILE __."
"; // Output F: \ xampp \ htdocs \ wordpress \ wp-content \ plugins \ wp-smtp \ wp_smtp_admin.php
Echo dirname (_ FILE __)."
"; // Output F: \ xampp \ htdocs \ wordpress \ wp-content \ plugins \ wp-smtp
Echo basename (_ FILE __)."
"; // Output wp_smtp_admin.php


2. Test some built-in functions of wordpress:

The Code is as follows:

Echo plugin_basename (_ FILE __)."
"; // Output wp-smtp/wp_smtp_admin.php
Echo dirname (plugin_basename (_ FILE __))."
"; // Output wp-smtp
Echo plugin_dir_url (_ FILE __)."
"; // Output
Echo plugin_dir_path (_ FILE __)."
"; // Output F: \ xampp \ htdocs \ wordpress \ wp-content \ plugins \ wp-smtp/
Echo plugins_url ()."
"; // Output
Echo plugins_url ('',__ FILE __)."
"; // Output
Echo plugins_url ('/img/blq_32_32.jpg' ,__ FILE __)."
"; // Output


Now let's take a look at the dirname and basename descriptions.

The dirname () function returns the directory part of the path, while the basename () function returns the file name part of the path. From here, we can easily see the above result.

I hope this article will help you with PHP programming.

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