1. Custom function
A function is a block of code that can be executed whenever needed.
Function Declaration:
All functions begin with the keyword "function()"
Name the function - the name of the function should suggest its function. Function names start with a letter or underscore.
Add "{" - The part after the opening curly brace is the code of the function.
Insert function code
Add a "}" - the function ends by closing the curly brace.
Example:
[php]
<html>
<body>
<?php
function writeMyName()
{
echo "jeremyLin";
}
writeMyName();
?>
</body>
</html>
2. Function - Adding Parameters
Our first function is a very simple one function. It can only output a static string.
We add more functionality to functions by being able to add parameters. A parameter is like a variable.
Example:
[php]
<html>
<body>
<?php
function writeMyName($fname)
{
echo $fname . "jeremy.<br />";
}
echo "My name is ";
writeMyName("lin");
echo "My name is ";
writeMyName("kobe");
echo "My name is ";
writeMyName("John");
?>
</body>
</html>3. Function - return value
Functions can also be used to return values.
[php]
<html>
<body>
<?php
function add($x,$y)
{
$total = $x + $y;
return $total;
}
echo "4 + 26 = " . add(4,26);
?>
</body>
</html>
The output of the above code:
4+26=30
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