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Explain various data types in PHP ?

PHP supports several data types, which are used to store different kinds of values.

Here are the main data types in PHP:

1. Integer:

An integer is a whole number, such as 0, 1, 2, -3, etc. In PHP, integers can be specified in decimal, hexadecimal, or octal notation.

$myInt = 42; // decimal notation
$myInt = 0xFF; // hexadecimal notation
$myInt = 077; // octal notation

2. Float:

A float is a decimal number with a fractional part, such as 3.14, 2.0, etc.

$myFloat = 3.14;

3. String:

A string is a sequence of characters, such as “hello”, “world”, etc. In PHP, strings can be enclosed in single quotes or double quotes.

$myString = 'Hello, world!';
$myString = "Hello, world!";

4. Boolean:

A boolean is a value that is either true or false.

$myBool = true;
$myBool = false;

5. Array:

An array is a collection of values, which can be accessed using an index or a key.

$myArray = array(1, 2, 3); // numeric array
$myArray = array('key1' => 'value1', 'key2' => 'value2'); // associative array

6. Object:

An object is an instance of a class, which has properties and methods.

class MyClass {
  public $myProp = 'Hello, world!';

  public function myMethod() {
    echo $this->myProp;

$myObj = new MyClass();

7. Null:

Null is a special value that represents the absence of a value.

$myVar = null;