System predefined delegation Summary of Yii20 predefined alias functions

The examples in this article describe Yii2.0 predefined aliases. Share it with everyone for your reference. The details are as follows:

To summarize here, there are 12 default predefined aliases, including 11 path aliases and only 1 URL alias @web:

@yii represents the directory where the Yii framework is located. It is also the location where the yiiBaseYii class file is located;
@app represents the root directory of the running application, usually digpage.com/frontend;
@vendor represents the directory where the Composer third-party library is located, usually @app/vendor or @app/. ./vendor ;
@bower indicates the directory where the Bower third-party library is located, usually @vendor/bower;
@npm indicates the directory where the NPM third-party library is located, usually @vendor/npm;
@runtime indicates the running of the running application The directory used to store runtime files, usually @app/runtime;
@webroot represents the directory where the entry file index.php of the running application is located, usually @app/web;
@web URL alias, indicating the current The root URL of the application, mainly used for the front end;
@common represents the common folder;
@frontend represents the folder where the front-end application is located;
@backend represents the folder where the background application is located;
@console represents the file where the command-line application is located folder;

Other second-level names registered with Yii extensions installed using Composer.

In this way, in the entire Yii application, as long as the above alias is used, a specific path or URL can be expressed conveniently and uniformly.

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The above has introduced the system predefined delegation and a summary of the predefined alias function of Yii20, including the content of the system predefined delegation. I hope it will be helpful to friends who are interested in PHP tutorials.