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 the quotation marks, either single or double quotation marks can be used

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)

PHP floating-point number

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

PHP logic

The logic is true or false.

$x =true; $y =false;

Logic is often used for conditional testing

PHP arrays

An array stores multiple values in a variable.

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

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:

<?phpclass car{  var $color;  function Car ($color = "green") {    $this->color = $color;  }  function What_color () {    return $this->color;  }}? >

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:

<?php$x= "Hello world!"; $x =null;var_dump ($x);? >

PHP Data type