"PHP Learning" PHP Data type

string, Integer, floating-point number, logical, array, object, NULL. PHP String

The string is a sequence of characters, such as "Hello world!".

The string can be any text within quotation marks. You can use single or double quotation marks: instance

<?  $x = "Hello world!" ; Echo $x ; Echo "<br>"$x = ' Hello world! ' ; Echo $x ;? >

Run instance PHP integer

Integers are numbers that have no decimals.

Integer rule:

• Integers must have at least one number (0-9)
• Integers cannot contain commas or spaces
• Integers cannot have decimal points
• Integers can be both positive and negative
• Integers can be specified in three formats: decimal, hexadecimal (prefix 0x), or octal (prefix 0)

In the example below, we will test for different numbers. PHP Var_dump () returns the data type and value of the variable: instance

<?PHP$x= 5985;Var_dump($x);Echo"<br>"; $x=-345;//Negative numberVar_dump($x);Echo"<br>"; $x= 0x8c;//Hexadecimal numberVar_dump($x);Echo"<br>";$x= 047;//octal numberVar_dump($x);?>

Running instance PHP floating point number

Floating-point numbers are digits that have decimal or exponential form.

In the example below, we will test for different numbers. PHP Var_dump () returns the data type and value of the variable: instance

<?  $x = 10.365; Var_dump ($x); Echo "<br>"$x = 2.4e3; Var_dump ($x); Echo "<br>"$x = 8E-5; Var_dump ($x);? >

Running the instance PHP logic

The logic is true or false.

$x=true; $y=false;

Logic is often used for conditional testing. You'll learn more about conditional testing in the chapters later in this tutorial. PHP arrays

An array stores multiple values in a variable.

In the following example, we will test different arrays. PHP Var_dump () returns the data type and value of the variable: instance

<?  $cars=array("Volvo", "BMW", "SAAB"); Var_dump ($cars);? >

Running an instance

You'll learn more about arrays in the chapters later in this tutorial. PHP Object

Objects are data types that store data and information about how to work with the data.

In PHP, you must explicitly declare an object.

First we must declare the class of the object. For this, we use the class keyword. A class is a structure that contains properties and methods.

We then define the data type in the object class, and then use this data type in an instance of the class: instance

<? PHP class car{  var$color;   function Car ($color= "Green") {    $this$color;  }   function What_color () {    return$this,color;  }}? >

Running an instance

You will learn more about objects in the chapters later in this tutorial. PHP NULL Value

A special NULL value indicates that the variable has no value. Null is the only possible value for the data type NULL.

The null value indicates whether the variable is empty. Also used to differentiate between empty strings and null-valued databases.

You can empty the variable by setting the value to NULL: instance

<? PHP $x= "Hello world!" ; $x=null; Var_dump ($x);? >

Running an instance

"PHP Learning" PHP Data type