Use the Yay preprocessor library to add syntax sugar to PHP to easily implement more elegant code! This article will demonstrate how to use the Yay library to add Ruby-like array slice syntax sugar for PHP. $many[4..8]
Core points:
- Yay is a preprocessor library that allows developers to add syntactic sugar to other languages ??to PHP through macros.
- Yay breaks the code string into tags, builds an abstract syntax tree (AST), then replaces the macro element with real PHP code, and reassembles the PHP code.
- While there are some limitations in variable scope and parser, Yay still allows for the creation of cleaner and more efficient PHP code.
to get the second, third, and fourth elements of an array few = many[1..3]. And in PHP, we need to use many to achieve the same function. Obviously, Ruby's syntax is more concise and elegant. $few = array_slice($many, 1, 3);
Get to use macros:
First of all, we need to install the Yay library:
$ composer require yay/yay:dev-masterNext, we create a file called
with the following code: array_slice.yphp
macro {
T_VARIABLE·A[
···range
]
} >> {
eval(
'$list = ' . →(T_VARIABLE·A) . ';' .
'$lower = ' . explode('..', →(···range))[0] . ';' .
'$upper = ' . explode('..', →(···range))[1] . ';' .
'return array_slice($list, $lower, $upper - $lower);'
)
}
macro {
→(···expression)
} >> {
··stringify(···expression)
}
$many = [
"She walks in beauty",
"like the night",
"of cloudless climes",
"and starry skies",
"And all that's best",
"of dark and bright",
"meet in her aspect",
"and her eyes",
"...",
];
$lower = 4;
$upper = 8;
$few = $many[$lower..$upper];
Then, use the Yay compiler to convert the file to standard PHP code: .yphp
$ vendor/bin/yay array_slice.yphp >> array_slice.phpThe generated
file will contain the following (may differ slightly, depending on the Yay version): array_slice.php
$many = [
"She walks in beauty",
"like the night",
"of cloudless climes",
"and starry skies",
"And all that's best",
"of dark and bright",
"meet in her aspect",
"and her eyes",
"...",
];
$lower = 4;
$upper = 8;
$few = eval(
'$list = ' . '$many' . ';'.
'$lower = ' . explode('..', '$lower..$upper')[0] . ';' .
'$upper = ' . explode('..', '$lower..$upper')[1] . ';' .
'return array_slice($list, $lower, $upper - $lower);'
);Working principle:
Yay breaks the code string into tags through a parser, builds an abstract syntax tree (AST), and replaces the macro with real PHP code, and eventually generates executable PHP code. Due to the limitations of the scope of PHP variables, the macro uses the function, which is slightly inelegant, but effectively implements the expected functions. eval()
The above is the detailed content of PHP Macros for Fun and Profit!. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1793
16
1736
56
1587
29
267
587
How to set PHP time zone?
Jun 25, 2025 am 01:00 AM
TosettherighttimezoneinPHP,usedate_default_timezone_set()functionatthestartofyourscriptwithavalididentifiersuchas'America/New_York'.1.Usedate_default_timezone_set()beforeanydate/timefunctions.2.Alternatively,configurethephp.inifilebysettingdate.timez
What are the best practices for writing clean and maintainable PHP code?
Jun 24, 2025 am 12:53 AM
The key to writing clean and easy-to-maintain PHP code lies in clear naming, following standards, reasonable structure, making good use of comments and testability. 1. Use clear variables, functions and class names, such as $userData and calculateTotalPrice(); 2. Follow the PSR-12 standard unified code style; 3. Split the code structure according to responsibilities, and organize it using MVC or Laravel-style catalogs; 4. Avoid noodles-style code and split the logic into small functions with a single responsibility; 5. Add comments at key points and write interface documents to clarify parameters, return values ??and exceptions; 6. Improve testability, adopt dependency injection, reduce global state and static methods. These practices improve code quality, collaboration efficiency and post-maintenance ease.
How do I execute SQL queries using PHP?
Jun 24, 2025 am 12:54 AM
Yes,youcanrunSQLqueriesusingPHP,andtheprocessinvolveschoosingadatabaseextension,connectingtothedatabase,executingqueriessafely,andclosingconnectionswhendone.Todothis,firstchoosebetweenMySQLiorPDO,withPDObeingmoreflexibleduetosupportingmultipledatabas
How to quickly test PHP code snippets?
Jun 25, 2025 am 12:58 AM
ToquicklytestaPHPcodesnippet,useanonlinePHPsandboxlike3v4l.orgorPHPize.onlineforinstantexecutionwithoutsetup;runcodelocallywithPHPCLIbycreatinga.phpfileandexecutingitviatheterminal;optionallyusephp-rforone-liners;setupalocaldevelopmentenvironmentwith
How do I use page caching in PHP?
Jun 24, 2025 am 12:50 AM
PHP page caching improves website performance by reducing server load and speeding up page loading. 1. Basic file cache avoids repeated generation of dynamic content by generating static HTML files and providing services during the validity period; 2. Enable OPcache to compile PHP scripts into bytecode and store them in memory, improving execution efficiency; 3. For dynamic pages with parameters, they should be cached separately according to URL parameters, and avoid cached user-specific content; 4. Lightweight cache libraries such as PHPFastCache can be used to simplify development and support multiple storage drivers. Combining these methods can effectively optimize the caching strategy of PHP projects.
How to upgrade PHP version?
Jun 27, 2025 am 02:14 AM
Upgrading the PHP version is actually not difficult, but the key lies in the operation steps and precautions. The following are the specific methods: 1. Confirm the current PHP version and running environment, use the command line or phpinfo.php file to view; 2. Select the suitable new version and install it. It is recommended to install it with 8.2 or 8.1. Linux users use package manager, and macOS users use Homebrew; 3. Migrate configuration files and extensions, update php.ini and install necessary extensions; 4. Test whether the website is running normally, check the error log to ensure that there is no compatibility problem. Follow these steps and you can successfully complete the upgrade in most situations.
Steps to configure a PHP development environment on Linux
Jun 30, 2025 am 01:57 AM
TosetupaPHPdevelopmentenvironmentonLinux,installPHPandrequiredextensions,setupawebserverlikeApacheorNginx,testwithaPHPfile,andoptionallyinstallMySQLandComposer.1.InstallPHPandextensionsviapackagemanager(e.g.,sudoaptinstallphpphp-mysqlphp-curlphp-mbst
PHP beginner guide: Detailed explanation of local environment configuration
Jun 27, 2025 am 02:09 AM
To set up a PHP development environment, you need to select the appropriate tools and install the configuration correctly. ①The most basic PHP local environment requires three components: the web server (Apache or Nginx), the PHP itself and the database (such as MySQL/MariaDB); ② It is recommended that beginners use integration packages such as XAMPP or MAMP, which simplify the installation process. XAMPP is suitable for Windows and macOS. After installation, the project files are placed in the htdocs directory and accessed through localhost; ③MAMP is suitable for Mac users and supports convenient switching of PHP versions, but the free version has limited functions; ④ Advanced users can manually install them by Homebrew, in macOS/Linux systems
