php - Basic question about REST APIs enpoint creation and access and how to create an app script

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Solution:

1. The answer to this question is yes. Common practice is to have a PHP application use the front controller pattern, where a single publicly available script (usually index.php) is solely responsible for delegating all incoming requests to the appropriate part of your application (your actual "controllers"), often relying on server configuration to do the actual "redirecting" (rewriting, allowing for omitted file extensions and "pretty url's"). This design approach is common because most popular frameworks support it out of the box, from the Laravel and Symfony big boys, to microframeworks like Slim, Silex and Lumen. Perhaps giving these frameworks a try will help you understand how this works and how they do it.

2. Not sure if I understand your question correctly, but it sounds like you are being asked to provide/implement a deployment script; a script that runs a set of commands in order to easily install, bootstrap and start the entire application. Think of commands like composer install, commands that initialize/seed the database, or commands that build your frontend assets. The actual commands are specific to the application, but the goal is to easily provide a fresh installation and deployment of your application by executing a single script. These scrips are usually sh scripts executed from the command line.