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PHP Functions

PHP Functions

What you'll learn

  • Understand the main ideas in PHP Functions.
  • See a working example and explanation to help you learn by doing.
  • Follow a clear path to the next lesson in this topic.

When to use this lesson

Use this lesson when you want to understand the key concepts behind PHP Functions.

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PHP Functions

The real power of PHP comes from its functions.

PHP has more than 1000 built-in functions, and in addition, you can create your own custom functions to make your code modular and reusable.

Creating a Custom Function

A user-defined function declaration starts with the word function.

Function Example

<?php
function writeMsg() {
  echo "Hello world!";
}


writeMsg(); // Call the function
?>

Function Arguments & Returning Values

Information can be passed to functions through arguments. An argument is just like a variable. If you want a function to return a computed value back to you instead of printing it directly, use the return statement.

Return Example

<?php
function sum($x, $y) {
  $z = $x + $y;
  return $z;
}


echo "5 + 10 = " . sum(5, 10);
?>

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