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Php migration4.variables () function

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Handling of global variables

While handling of global variables had the focus on to be easy in PHP 3 and early versions of PHP 4, the focus has changed to be more secure. While in PHP 3 the following example worked fine, in PHP 4 it has to be unset(unset($GLOBALS["id"]));. This is only one issue of global variable handling. You should always have used $GLOBALS, with newer versions of PHP 4 you are forced to do so in most cases. Read more on this subject in the global references section.

Example C-1. Migration of global variables

<?php
$id
= 1;
function
test()
{
    global
$id;
    unset(
$id);
}
test();
echo(
$id); // This will print out 1 in PHP 4
?>

Php migration4.variables Function syntax tag

migration4.variables php code on this is provided for your study purpose, it will guide you to know how create and design a website using php. use it to practice and train your self online



Php migration4.variables syntax tutorial

php tutorial guide and code design are for easy learning and programming. The code practice section provided at the top is for practising of this syntax. Use the code section up to practice your php programming online. Learning php is very easy, all you need is to use the examples on this site and practice them to perfect your skills.


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