In PHP, variables always start with the character
$. This symbol
differentiates variables from other entities (functions, keywords ...).
A special feature of PHP is that the variables are not typed. It is not
necessary to declare the type (int, char, array ...) when creating the
variables. The PHP engine will take care of detecting the most suitable type. In
the vast majority of cases, this syntax is very user-friendly, even
if it (rarely) causes some inconvenience.
Here is an example:
$entier = 5; $booleen = TRUE; $chaine = 'String'; $tableau = array(1, 2, 3);
Note here the use of the HTML tag
<pre> which allows the browser to display a
preformatted text. Line breaks and spaces are displayed as is.
Also note the use of the
print_r function which displays
the table in a user-friendly form.
PHP variables are provided by different sources:
$ _GET ['id']will be worth 18)
Creating a PHP script that displays