PHP Function

A function is a block of code to accomplish a specific task. A function is executed when it is called. A function returns or does not return a value;

A function that does not return a value

The following syntax can be used to define a function that deos not return a value.


function function_name(){
   statements;
}
 
Note: the name of function must start with a letter or underscore not a number.
Example:
<html>
<body>
 
<?php
//defining function:printHello
function printHello(){
 echo "Hello";
}
//calling the function:printHello
printHello();
 
?>
 
</body>
</html>

A function that returns a value

When you want to get the value generated from a function to be used elsewhere in your code, you will need to defind a function that can return a value. The return keyword is used to return the value of the function to another function or code block that calls it.


function function_name(){
   statements;
   return value;
}
 
Example:
<html>
<body>
 
<?php
//defining function: sum
function sum(){
  $s=10+20;
  return $s;
}
//calling the function: sum
$total=sum();
echo "Total=".$total;
 
?>
</body>
</html>
 

Function parameters


Parameters are values to be passed to the function. In the example below, a person' name is passed tothe printName function. You can pass more than one parameter to the function by separating them with comma.

Example:

<html>
<body>
 
<?php


//defining function:printName
function printName($name){
 echo "Hello ".$name;
}
//calling the function:printName
printName("Khorn Channa");
 
?>
 
</body>
</html>



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