Dependency injection in PHP is a type of software design pattern that allows objects to receive other objects that they depend on. This means that an object does not create or make use of another object; rather, it is given the other object by an external source. This helps to keep code clean and organized and makes it easier to make changes or add functionality in the future.

Object Oriented ProgrammingPHPProgramming. Dependency injection is a procedure where one object supplies the dependencies of another object. Dependency Injection is a software design approach that allows for avoiding hard-coding dependencies and makes it possible to change the dependencies both at runtime and compile time.