PHP Function

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What are PHP functions?

A function is a piece of code that receives one or more parameter then process and returns a value.

PHP has a huge collection of internal functions that can call directly into your PHP code to perform a specific task as: gettype (), print_r (), var_dump, fopen(), fread() etc.

• A function will not execute automatically when a page loads on browser.
• A function will be executed when is called.

Syntax:

Let's create a PHP function that will write a simply message to your browser when you call it.

<?php

/* Defining a PHP Function */

function write_Message() {

echo "Welcome to agernic.com.

Today we will have a new lesson:

how to create a function in PHP";

}



/* Calling a PHP Function */

write_Message();

?>

Output: Welcome to agernic.com. Today we will have a new lesson: how to create a function in PHP

Related subjects:
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Tags: php function: function use, return, return type, parameters. optional parameter, exists, use external variable, default parameter value, return array, function list
What are PHP functions?
What is PHP function with examples?
What is PHP function name?
Are there functions in PHP?

When you define a function you can specify parameters to accept input values

The parameters work as variables inside function

<?php

function sumFunction($num_1, $num_2) {

$my_sum = $num_1 + $num_2;

echo "Sum of this two numbers is : $my_sum";

}



sumFunction(34, 21);

?> 

Output: Sum of this two numbers is : 55

To see the result of the PHP code above please click Execute

An argument is like a variable

You can add as many arguments you need, pnly separate them with a comma.

<?php
  function surName($famname) {

  echo "$famname Jones.<br>";

  }

surName("Janet");

  surName("Gregor");

  surName("Stanly");

  surName("Jim");

  surName("Korg");

  ?>