Working with Functions in PHP
Oct 01, 2013, by admin
A functions is an independent block of code that performs a specific task and can be used more than once at a different points within the main program.
The real power of PHP comes from its functions.
In PHP, there are more than 700 built-in functions.
A function will be executed by a call to the function.
You may call a function from anywhere within a page.
Create a PHP Function
A function will be executed by a call to the function.
Syntax
function functionName()
{
code to be executed;
}
PHP function guidelines:
Give the function a name that reflects what the function does
The function name can start with a letter or underscore (not a number)
Example
A simple function that print city name when it is called:
<html>
<body>
<?php
function cityName()
{
echo “Delhi”;
}
echo “City Name is : “; cityName();
?>
</body>
</html>
Output:
City Name is : Delhi
PHP Functions – Adding parameters
To add more functionality to a function, we can add parameters. A parameter is just like a variable.
Parameters are specified after the function name, inside the parentheses.
Example
The following example will write different city names:
<html>
<body>
<?php
function cityName($cityname)
{
echo $cityname . “<br />”;
}
echo “City name is “; cityName(“Mumbai”);
?>
</body>
</html>
Output:
City name is Mumbai.
Example
The following function has two parameters:
<html>
<body>
<?php function cityName($cityname,$country)
{
echo “City : “.$cityname . ” and Country :” . $country . “<br />”;
}
cityName(“Delhi”,”India”);
?>
</body>
</html>
Output:
City : Delhi and Country :India
PHP Functions – Return values
To let a function return a value, use the return statement.
Example
<html>
<body>
<?php
function getValue($value)
{
return $value;
}
echo “The Value is: “. getValue(100);
?>
</body>
</html>
Output:
The Value is:100
