Getting started with PHP functions

PHP functions are getting started. read about PHP functions. the real power of PHP comes from its functions. PHP provides over 700 built-in functions. In this tutorial, we will show you how to create your own functions. Creating a PHP function is a code block that can be executed when needed. Create a PHP function: all "> <LINKhref =" http ://

The real power of PHP comes from its functions.

PHP provides over 700 built-in functions.

PHP functions

In this tutorial, we will explain how to create your own functions.

Create a PHP function

A function is a code block that can be executed when needed.

Create a PHP function:

All functions start with the keyword "function ()".

Name function-the function name should prompt its function. The function name must start with a letter or underscore.
Add "{"-the section after the opening curly braces is the function code.

Insert function code

Add a "}"-the function ends by closing curly braces.

Example

A simple function outputs my name when it is called:

Function writeMyName (){
Echo "David Yang ";
}

WriteMyName ();
?>

Use PHP functions

Now, we need to use this function in the PHP script:

<? Php
Function writeMyName (){
Echo "David Yang ";
}

Echo "Hello world! ";
Echo "My name is ";
WriteMyName ();
Echo ". That's right ,";
WriteMyName ();
Echo "is my name .";
?>

Output of the above code:

Hello world!
My name is David Yang.
That's right, David Yang is my name.

PHP functions-add parameters

Our first function is a very simple function. It can only output one static string.

You can add parameters to add more functions to the function. The parameter is similar to a variable.

You may have noticed that the function name is enclosed in parentheses, such as writeMyName (). Parameters are defined in brackets.

Example 1

In the following example, different names are output, but the surnames are the same:

<? Php
Function writeMyName ($ fname ){
Echo $ fname. "Yang .";
}

Echo "My name is ";
WriteMyName ("David ");

Echo "My name is ";
WriteMyName ("Mike ");

Echo "My name is ";
WriteMyName ("John ");
?>

Output of the above code:

My name is David Yang.
My name is Mike Yang.
My name is John Yang.

Example 2

The following functions have two parameters:

<? Php
Function writeMyName ($ fname, $ punctuation ){
Echo $ fname. "Yang". $ punctuation ."";
}

Echo "My name is ";
WriteMyName ("David ",".");

Echo "My name is ";
WriteMyName ("Mike ","! ");

Echo "My name is ";
WriteMyName ("John ","...");
?>

Output of the above code:

My name is David Yang.
My name is Mike Yang!
My name is John Yang...

PHP function-return value

Functions can also be used to return values.

Example

<? Php
Function add ($ x, $ y ){
$ Total = $ x + $ y;
Return $ total;
}

Echo "1 + 16 =". add (1, 16 );
?>

Output of the above code:

1 + 16 = 17