HTML Tutorial
PHP Function
The php function is similar to other functions from other programming languages.
The function is a pice of programming code which takes one or more inputs as parameters and does some processing and returns a value.
A user-defined function declaration starts with the word function:
Syntax:
function functionName() {
code to be executed;
}
Creating PHP Function - how? - example
In the example below, we have created a function named "WriteMyMessage()".
The function outputs "This is your first PHP function. Have a nice day".
To call the function, just write its name:
Example 1: Using implode() to go from an Array to a String
<?php
/* Defining a PHP Function */
function WriteMyMessage() {
echo "This is your first PHP function.
Have a nice day";
}
/* Calling a PHP Function */
WriteMyMessage();
?>
/* Defining a PHP Function */
function WriteMyMessage() {
echo "This is your first PHP function.
Have a nice day";
}
/* Calling a PHP Function */
WriteMyMessage();
?>
PHP cod above will display this result -
Note: There are two parts of function which should be clear to you −
Creating a PHP Function
Calling a PHP Function
Creating a PHP Function
Calling a PHP Function
PHP Functions with Parameters - How to create
PHP gives you the option to pass parameters into a function. You can pass as many parameters as you can.
The following example has three integer parameters, adds them and then prints them together.
Example 2:
The PHP cod above will display this result -
<?php
function addFunction ( $number1, $number2, $number3 ) {
$sum = $number1 + $number2 + $number3;
echo "Sum of the three numbers is : $sum" ;
}
addFunction( 10, 20, 40);
?>
function addFunction ( $number1, $number2, $number3 ) {
$sum = $number1 + $number2 + $number3;
echo "Sum of the three numbers is : $sum" ;
}
addFunction( 10, 20, 40);
?>
The PHP cod above will display this result -
php function, exist, return, return array, get _exists, as argument
PHP Function, Creating PHP Function - how? - example - php tutorial
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