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Data Types and PHP Automatic Data Typing
PHP sports a cool feature called automatic data typing. A PHP developer can claim variables and use them in most common situations without having to claim the data type that the variable is. But this is also a double edged sword because as a developer gets more advanced they may create functions or scripts that only accept one data type, and throw errors if you feed it a different type. But that is usually only in the most complex of PHP applications.

For instance, if my imported script and function is expecting an integer type variable and I feed it a string type, I will get an error and know that I must not try to feed it a string... it needs an integer type variable. No big deal, I will just make sure a number type variable is all that gets sent through that mechanism.

Here are the data types:
Boolean, Integer, Floating Point Number, String, Array, Object, Resource, Null

Learn HTML
// Boolean... true or false data types
$userChoice true;

// Integer.... whole numbers
$num1 3;

// Floating Point Numbers
$num2 8.357

// String... a set of alphanumeric characters
$string1 "Hello World, I just turned 21!";

// Array... we cover building arrays in later lessons
$my_friend_array = array(=> 'Joe'=> 'Adam'=> 'Brian'=> 'Susan'=> 'Amy'=> '0'=> 'Bob');

// Object...
// Objects work with classes, which we will cover later

// Resource...
// A special variable, holding a reference to an external resource. 
// Resources are created and used by special functions.

// Null... value for missing, empty, or unset variables. If null... it has no value and is not set.
$var1 NULL// Casting a variable to null will remove the variable and unset its value

PHP has functions to test whether or not a variable is a certain "type". This is known as the is_* function family.
Learn HTML
// set the variable and its value
$myVar "Adam Khoury";
// Run simple if and else statement to see if it is a string or not
if (is_string($myVar)) {
} else {

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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at