PHP Anonymous Function

In this chapter you will learn:

1. What is PHP Anonymous Functions
2. Why do we need Anonymous Functions
3. Syntax to create anonymous functions
4. Example - creates an anonymous function dynamically based on the value of a variable

Description

PHP anonymous functions have no name.

Why

You might want to create anonymous functions for two reasons:

• To create functions dynamically
• To create short-term, disposable functions

Syntax

To create an anonymous function, you use separated list of parameters if any, and the code for the function body.

Example

Here's an example that creates an anonymous function dynamically based on the value of a variable:

<?PHP// j a v a  2s.com
        $mode = "+"; 
        $processNumbers = create_function( '$a, $b', "return \$a $mode \$b;" ); 
        echo $processNumbers( 2, 3 ); // Displays "5"   
?>

The code above generates the following result.

This code uses the value of the $mode variable as the operator used to process its two arguments, $a and $b. For example, if you change $mode to "*", the code displays "6".

Next chapter...

What you will learn in the next chapter:

1. What is PHP static variable
2. Syntax to declare PHP static variable
3. Note for static variable
4. Example - static variable

PHP Function

PHP Function Create

PHP Function Parameter

PHP Function Default Parameters

PHP Variable Length Parameter

PHP Function Reference Parameter

PHP Function Return

PHP Return Reference

PHP Variable Scope in Functions

PHP Global Variables

PHP Recursive Functions

PHP Anonymous Function

PHP static variable