Getting Started with PHP functions _php tutorial

The real power of PHP comes from its functions.

In PHP, more than 700 built-in functions are available.

PHP functions

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

Creating PHP Functions

A function is a block of code that can be executed at any time when it is needed.

To Create a PHP function :

All functions use the keyword "function ()" to start

Named function-the name of the function should indicate its function. The function name begins with a letter or underscore.
Add "{"-the section after the opening curly brace is the code of the function.

inserting function code

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

Example

A simple function that can output my name when it is called:

Using PHP functions

Now, we're going to use this function in our PHP script:

"; echo" My name is "; Writemyname (); echo". That's right, "; Writemyname (); echo" is my name. ";? >

The output of the above code:

Hello world! My name is David Yang.that's right and David Yang is my name.

PHP functions-Adding parameters

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

With the ability to add parameters, we add more functionality to the function. The parameter is similar to a variable.

You may notice that the function name is followed by a parenthesis, such as Writemyname (). The parameters are specified in parentheses.

Example 1

The following example tells the output a different name, but the last name is the same:

"; } echo "My name is"; Writemyname ("David"), echo "My name is", Writemyname ("Mike"), echo "My name is"; Writemyname ("John"); >

The output of the above code:

My name is David yang.my name was Mike yang.my name is John Yang.

Example 2

The following function has two parameters:

"; } echo "My name is"; Writemyname ("David", "."); echo "My name is"; Writemyname ("Mike", "!"); echo "My name is"; Writemyname ("John", "..."); >

The output of the above code:

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

PHP Functions-return values

Functions can also be used to return values.

Example

The output of the above code:

1 + 16 = 17

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