What is the php entry file?

File entries are generally divided into single file entries and multi-file entries. Of course, there may be other file entries that have not been seen before.

Single file entry, of course, means that the file index.php is always accessed when accessing the website, but the content displayed inside is loaded according to the background parameters, such as: http://IP/index .php? Conttoller=index&action=show&id=1

Multi-file entry of course means that in addition to the index.php file name, there are other file accesses in the website, such as index.php and about.php under the same website. ………..wait.

The entry file is mainly completed:

·Define the framework path and project path (optional)

·Define the debugging mode and application mode (optional)

·Define system-related constants (optional)

·Load the framework entry file (required)

Related recommendations: "php Getting Started Tutorial"

By default, the framework already comes with an application entry file (and the default directory structure), the content is as follows:

define('APP_PATH','./Application/');
require './ThinkPHP/ThinkPHP.php';

If you change the project directory (for example, change Application to Apps), you only need to change the APP_PATH constant definition in the entry file:

define('APP_PATH','./Apps/');
require './ThinkPHP/ThinkPHP.php';

Note: The definition of APP_PATH supports relative paths and absolute paths Path, but must end with "/".

If you adjust the location or directory name of the framework core directory, you only need to modify it like this:

define('APP_PATH','./Application/');
require './Think/ThinkPHP.php';

You can also define a separate THINK_PATH constant for introduction:

define('APP_PATH','./Application/');
define('THINK_PATH',realpath('../Think').'/');
require THINK_PATH.'ThinkPHP.php';

and Like APP_PATH, the THINK_PATH path definition must also end with "/". Defining absolute paths for THINK_PATH and APP_PATH will improve the loading efficiency of the system.

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