How to Make a PHP Function
In PHP, a function is created using the
function command. Then, after a space, follows
the function name and parentheses.
See the example:
<?php
function func()
{
echo 'text';
}
func(); // will output 'text'
?>
Instead of the echo command,
return is usually used.
In this case, the result of the function's work
is not immediately output to the screen, but can
be stored in a variable.
See the example:
<?php
function func()
{
return 'text';
}
$str = func(); // first store in a variable, then output to the screen
echo $str; // will output 'text'
?>
The parentheses can be empty, or they can contain parameters that the function accepts. Parameters are ordinary PHP variables.
Let's make a function that will parameter take a number and return its square:
<?php
function func($num)
{
return $num * $num;
}
echo func(2); // will output 4
echo func(3); // will output 9
?>
