Official docs outline
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More in PHP packages
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symfony/http-foundation Defines an object-oriented layer for the HTTP specification
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phpunit/php-code-coverage Library that provides collection, processing, and rendering functionality for PHP code coverage information.
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symfony/service-contracts Generic abstractions related to writing services
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sebastian/exporter Provides the functionality to export PHP variables for visualization
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sebastian/comparator Provides the functionality to compare PHP values for equality
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phpunit/php-file-iterator FilterIterator implementation that filters files based on a list of suffixes.
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sebastian/recursion-context Provides functionality to recursively process PHP variables
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webmozart/assert Assertions to validate method input/output with nice error messages.
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symfony/var-dumper Provides mechanisms for walking through any arbitrary PHP variable
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sebastian/environment Provides functionality to handle HHVM/PHP environments
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symfony/deprecation-contracts A generic function and convention to trigger deprecation notices
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phpunit/php-text-template Simple template engine.