5 Composer tips that PHPer needs to know, phpercomposer_PHP tutorial

5 Composer tips that PHPer needs to know, phpercomposer

Composer is a new generation of PHP dependency management tool. For its introduction and basic usage, you can read this article "Installation and Use of PHP Dependency Management Tool Composer". This article introduces five tips for using Composer, hoping to bring convenience to your PHP development.

1. Only update a single library

You only want to update a specific library and don’t want to update all its dependencies. It’s very simple:

composer update foo/bar

In addition, this trick can also be used to solve the "warning message problem". You must have seen warning messages like this:

Warning: The lock file is not up to date with the latest changes in composer.json, you may be getting outdated dependencies, run update to update them.

Damn, what went wrong? Don't panic! If you edit composer.json, you should see something like this. For example, if you add or update details such as a library description, author, more parameters, or even just a space, it will change the md5sum of the file. Composer will then warn you that the hash value is different from the one recorded in composer.lock.

So what should we do? The update command can update the lock file, but if it only adds some descriptions, it should not update any libraries. In this case, just update nothing:

$ composer update nothing
Loading composer repositories with package information
Updating dependencies
Nothing to install or update
Writing lock file
Generating autoload files

This way, Composer will not update the library, but composer.lock will be updated. Note that nothing is not a keyword in the update command. There is just nothing this package causes. If you type foobar, the result is the same.

If the Composer version you are using is new enough, you can use the --lock option directly:

composer update --lock

2. Install the library without editing composer.json

You may find it too troublesome to modify composer.json every time you install a library, then you can use the require command directly.

composer require "foo/bar:1.0.0"

This method can also be used to quickly open a new project. The init command has the --require option, which can automatically write composer.json: (note that we use -n so that we don’t have to answer the question)

$ composer init --require=foo/bar:1.0.0 -n
$ cat composer.json
{
  "require": {
    "foo/bar": "1.0.0"
  }
}

3. Derivation is easy

Have you tried the create-project command during initialization?

composer create-project doctrine/orm path 2.2.0

This will automatically clone the repository and check out the specified version. This command is very convenient to use when cloning a library, as there is no need to search for the original URI.

4. Consider caching, giving priority to dist packages

Composer from the past year will automatically archive the dist package you downloaded. By default, the dist package is used for tagged versions, such as "symfony/symfony": "v2.1.4", or wildcards or version ranges, "2.1.*" or ">=2.2,<2.3- dev" (if you use stable as your minimum-stability.

The dist package can also be used for branches such as dev-master. Github allows you to download the compressed package of a certain git reference. To force the use of a tarball instead of cloning the source code, you can use the --prefer-dist option of install and update.

Here is an example (I used the --profile option to show execution time):

$ composer init --require="twig/twig:1.*" -n --profile
Memory usage: 3.94MB (peak: 4.08MB), time: 0s

$ composer install --profile
Loading composer repositories with package information
Installing dependencies
 - Installing twig/twig (v1.12.2)
  Downloading: 100%

Writing lock file
Generating autoload files
Memory usage: 10.13MB (peak: 12.65MB), time: 4.71s

$ rm -rf vendor

$ composer install --profile
Loading composer repositories with package information
Installing dependencies from lock file
 - Installing twig/twig (v1.12.2)
  Loading from cache

Generating autoload files
Memory usage: 4.96MB (peak: 5.57MB), time: 0.45s

Here, the compressed package of twig/twig:1.12.2 is saved in ~/.composer/cache/files/twig/twig/1.12.2.0-v1.12.2.zip. Use it directly when reinstalling the package.

5. Consider modifications, source code first

When you need to modify the library, cloning the source code is more convenient than downloading the package. You can use --prefer-source to force selection of clone source code.

composer update symfony/yaml --prefer-source

Next you can modify the file:

composer status -v
You have changes in the following dependencies:
/path/to/app/vendor/symfony/yaml/Symfony/Component/Yaml:
  M Dumper.php

When you try to update a modified library, Composer will remind you and ask whether to abandon the modification:

$ composer update
Loading composer repositories with package information
Updating dependencies
 - Updating symfony/symfony v2.2.0 (v2.2.0- => v2.2.0)
  The package has modified files:
  M Dumper.php
  Discard changes [y,n,v,s,?]?

Prepare for production environment

Finally, when deploying code to the production environment, don’t forget to optimize automatic loading:

composer dump-autoload --optimize

You can also use --optimize-autoloader when installing packages. Without this option, you may see a 20% to 25% performance loss.

If you need help or want to know the details of a certain command, you can read the official documentation or check out this interactive cheat sheet made by JoliCode.

Leading the League of Legends, or how to play well, is there anything I need to know, tips, etc. I’m just a noob, I’m so lazy with words

1: Replenish troops 2: Send various signals 3: Know the first choice target you should attack in a team battle, don’t let others rush you and throw away various skills 4: Remember various BUFFs and dragon refresh time 5: Know how to insert and buy wards 6: Be able to use the skills that come with various equipment and props 7: Know how to support teammates from other lanes 8: Know what you should do when Kill 1 enemy player. At this time, the enemy chooses to retreat, but our teammates don't know how to take the opportunity to ward and kill a dragon or something. Instead, they rush to the other person's tower and don't dare to jump over the tower. You Q me, I Q you, and wait until the opponent dies. There are too many situations where one person is resurrected and rushes to destroy our party. You need to know when to do something. In short, practice this a lot. I can’t explain it in two sentences

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