# Category: Composer

## PHP: get version details from composer.json

Let’s say we have a composer.json file as follows:

{
"name": "mixable/blog",
"description": "mixable.blog",
"homepage": "https://mixable.blog",
"version": "4.0.1",
"type": "project",
"require": {
"php": "^8.x",
"vendor/package": "^4.3",
...
}
}

When using this file to manage the packages of an app, it might be necessary to check for the version of your app. This is possible by using the Composer class \Composer\InstalledVersions. The class provides different methods to access the details of the projects composer.json file.

## Get details about the root package

Details about the root package are available through the getRootPackage() method:

$package = \Composer\InstalledVersions::getRootPackage(); This method returns an array with the following details: name: string version: string reference: string pretty_version: string aliases: string[] dev: bool install_path: string type: string To get the apps version, you can use: $version = \Composer\InstalledVersions::getRootPackage()['version'];

## Get details about installed packages

There is a number of methods that provide additional information about the installed packages. Some examples:

Version of an installed package

$version = \Composer\InstalledVersions::getVersion('vendor/package'); Install path of an installed package $installPath = \Composer\InstalledVersions::getInstallPath('vendor/package');

A detailed description of all methods is available at https://getcomposer.org/doc/07-runtime.md#installed-versions.

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## Composer – PHP Fatal error: Allowed memory size of ## bytes exhausted

Composer may sometimes fail on some commands with this message:

PHP Fatal error: Allowed memory size of ## bytes exhausted <...


In this case, the PHP memory_limit should be increased.

Note: Composer internally increases the memory_limit to 1.5G.

To get the current memory_limit value, run:

php -r "echo ini_get('memory_limit').PHP_EOL;"


Try increasing the limit in your php.ini file (ex. /etc/php5/cli/php.ini for Debian-like systems):

; Use -1 for unlimited or define an explicit value like 2G
memory_limit = -1


Composer also respects a memory limit defined by the COMPOSER_MEMORY_LIMIT environment variable:

COMPOSER_MEMORY_LIMIT=-1 composer.phar <...>


Or, you can increase the limit with a command-line argument:

php -d memory_limit=-1 composer.phar <...>


This issue can also happen on cPanel instances, when the shell fork bomb protection is activated. For more information, see the documentation of the fork bomb feature on the cPanel site.