How to Create PHP Functions and Functional programming

How to Create PHP Functions and Functional programming Real workflow of PHP Comes from PHP Functions. and with the help of PHP Functions, Build our own functions, it’s more than 1000 build in Functions.

PHP functions is a  piece of code that can be reused many times to build function. It can take an argument list as input and return value. There are thousands of built-in functions in PHP.
php functions

In PHP Functions, we can define a Conditional functionFunction within Function and Recursive function etc.

The advantage of PHP Functions

Code Reusability: PHP functions are defined only once and can be reused many times to build PHP function, Just like as in other programming languages.

Less Code: It saves a lot of code because you don’t need to write the logic many times.  you can write the logic only once and reuse it.

Easy to understand: PHP functions separate the programming logic. So we can understand in the easier way the flow of the application because every logic is divided in the form of functions.

PHP User-defined Functions

We can declare and call user-defined functions easily. Let’s see the syntax to declare user-defined functions.

  • In PHP functions, we can create or Build our own functions.
  • A block of statements that can be used repeatedly in a program.
  • it will not execute immediately when a page loads.
  • the function will be executed by a call to the function.

Syntax

Note: Function name must start with the letter and underscore only like other labels in PHP. It can’t start with numbers or special symbols.

PHP Functions Example

Output:

PHP Function Arguments

Hence, pass the information in PHP function through arguments which are separated by a comma.

PHP supports Call by Value (default), Call by ReferenceDefault argument values and Variable-length argument list.

Let’s see the example to pass a single argument in PHP function.

Syntax

Output:

Example:

Output:

PHP Call By Reference

The value passed to the function doesn’t modify the actual value by default (call by value). But we can do so by passing the value as a reference.

Finally when the value passed to the function is called by value. To pass the value as a reference, you need to use the ampersand (&) symbol before the argument name.

Example:

Output:

PHP Function: Default Argument Value

We can specify a default argument value in the function. While calling PHP function if you don’t specify any argument, it will take the default argument.

Output:

PHP Function: Returning Value

Output:

 

Resource
PHP Function