Callback Functions

Lesson in the PHP Roadmap · Stage 5: Functions

Last updated 14 September 2026

What is Callback Functions?

A callback function in PHP is a function that is passed as an argument to another function. The receiving function can then invoke this function as needed. Callback functions are often used to define flexible or reusable code because they allow you to customize the behavior of a function without changing its structure.

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Free resources to learn Callback Functions

Official docsCallback Functions

Callback Functions: common questions

Can I learn Callback Functions in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Callback Functions in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Callback Functions tutorial for beginners?

It is lesson 35 of 120 in the free PHP roadmap, in stage 5, Functions. If you are new to PHP, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.