The VarDumper component provides mechanisms for walking through any arbitrary PHP variable. It provides a better dump() function that you can use instead of var_dump().
A set of abstractions extracted out of the Symfony components
Doctrine Inflector is a small library that can perform string manipulations with regard to uppercase/lowercase and singular/plural forms of words.
Create deep copies (clones) of your objects
The Process component executes commands in sub-processes.
A PSR-5 based resolver of Class names, Types and Structural Element Names
PHP 5.x support for random_bytes() and random_int()