How to add functions in php

How to add a function in php: 1. Create a PHP sample file; 2. Create a function through "function functionName(){...}".

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to add functions to php?

Creating PHP functions:

Functions are executed by calling functions.

Syntax

<?php
function functionName()
{
    // 要执行的代码
}
?>

PHP function guidelines:

The name of the function should indicate its function

The function name starts with a letter or underscore (not a number Beginning)

Example

A simple function that outputs my name when called:

Example

<?php
function writeName()
{
    echo "Kai Jim Refsnes";
}
 
echo "My name is ";
writeName();
?>

Output:

My name is Kai Jim Refsnes

PHP Function - Adding Parameters

In order to add more functions to the function, we can add parameters, which are similar to variables.

The parameters are specified within a bracket after the function name.

The following example will output different names, but the surname is the same:

Example

<?php
function writeName($fname)
{
    echo $fname . " Refsnes.<br>";
}
 
echo "My name is ";
writeName("Kai Jim");
echo "My sister&#39;s name is ";
writeName("Hege");
echo "My brother&#39;s name is ";
writeName("Stale");
?>

Output:

My name is Kai Jim Refsnes.
My sister's name is Hege Refsnes.
My brother's name is Stale Refsnes.

Recommended learning:《PHP video tutorial》

The above is the detailed content of How to add functions in php. For more information, please follow other related articles on the PHP Chinese website!