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PHP Functions


A function is a piece of code that can be used repeatedly in a PHP program. A function is mainly of two types:

  • Built in Functions; which are already defined in PHP Library.
  • User Defined Functions; which are created and defined by users.

Syntax:

function functionName(parameters) 
{
    code to be executed;
}

Rules for using Functions:

  • Name of a function should not start with a number. It can start with a letter or underscore.
  • Name of a function are case-insensitive.
  • A function starts with an opening curly brace ( { ) and ends with a closing curly brace ( } ).
  • Arguments are the variables, inside the parentheses, after the function name which is used to pass informations to functions.
  • For multiple arguments, comma should be used for separation.
  • Default argument value can also be specified in a function. If no argument is specified, the function will take the default argument.
  • Functions can also be used to return value.

Example

<!DOCTYPE html>
<html>
<body>
 
<?php
function writeMsg() {
	echo "My First Program using Function!";
}
 
writeMsg();
?>
 
</body>
</html>

Output

My First Program using Function!
Posted in PHP   
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