


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.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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.


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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software