


Laravel self-study first lesson: laravel download and installation, laravel first lesson_PHP tutorial
The first lesson of Laravel self-study: laravel download and installation, the first lesson of laravel
Install laravel locally, the php environment must be configured well, it is recommended to build xmapp with one click.
1. Download the program package directly from the official, official open source address: https://github.com/laravel/laravel (of course you can also download it from this website: http://www.golaravel.com/download/ for one-click installation package, you can see the page after downloading it, which will not be discussed here).
2. The decompressed folder is placed in the local environment directory. It is inaccessible when accessing http://localhost/laravel/. Laravel places the start page in the public directory. Visit the following address to start.
http://localhost/laravel/public/, unfortunately, an error was reported, as shown below, which means that the autoload.php directory under the vendor directory was not found. Of course you can't find this file because it doesn't exist.
3. Next, you need to install composer (install it yourself), run the command line, go to the laravel directory, and enter
<p>composer install</p>
command, as shown below:
Waiting for the installation to complete, the wendor directory will appear in the laravel folder.
4. You find that you still cannot access, and two big lines of "Whoops, looks like something went wrong." appear. This is because we have not turned on debugging, so we cannot see the error message.
Open app.php in the laravelconfig directory and modify
<p>'debug' => env('APP_DEBUG', false), 为 'debug' => env('APP_DEBUG', true),</p>
We saw the error message: ‘No supported encrypter found. The cipher and/or key length are invalid.’.
Don’t worry, this is because we did not configure the .env file. Find .env.example in the laravel directory and rename it .env. If you are using a window system, the following prompt will pop up
The solution is simple: save it with Notepad and rename it.
It is still inaccessible because the app_key of .env is not set. Enter at the command line:
<p>php artisan key:generate</p>
.env file will automatically generate app_key. The lazy way is to randomly create a 32-character key.
Seeing the words ‘Laravel 5’ means the installation is successful.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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