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Web Technologies-I

Notes Example:

<?php
$x = 8;

$y = 9;
$total = 0;

function getSum() {
GLOBAL $x, $y, $total;
$total = $x + $y;

echo $x. ‘ + ‘. $y. ‘ = ‘. $total;
}

getSum(); // 7 + 8 = 17
echo ‘<br />’. $total; // 17

?>
By declaring $x and $y variables GLOBAL within the function, the values of these variables can
be used inside the function.
The $total variable being set as GLOBAL, all references to it, inside or outside function, refers to
the same global version. Changing its value within the function will carry forward.
The code above will output:

7 + 8 = 17
17

4.3.2 Static Variables
A static variable exists only in a local function scope, but it does not lose its value when program
execution leaves this scope.
Declaring a variable static makes its value to be remembered by a function for the next time it
is called.

To declare a variable static, place the keyword STATIC (or static) in front of the variable (or more
variables separated by comma).

Example:

<?php

function f_local() {
$x = 0;
echo ‘<br /> x = ‘. $x;

$x++;
}

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