Special Types

There are 2 special data types in PHP

Resource
Null

Resource Data type:

It refers the external resources like database connection, FTP connection, file pointers, etc. In simple terms, a resource is a special variable which carrying a reference to an external resource.

Example 1

<?php
	$conn = ftp_connect("127.0.0.1") or die("Could not connect");
	echo get_resource_type($conn);
?>

Example 2

<?php
	$conn= ftp_connect("127.0.0.1") or die("could not connect");
	echo $conn;
?>

Example 3

<?php
	$handle = fopen("tpoint.txt", "r");
	var_dump($handle);
	echo "<br>";
	$conn= ftp_connect("127.0.0.1") or die("could not connect");
	var_dump($conn);
?>

Null Data Type:

A variable of type Null is a variable without any data. In PHP, null is not a value, and we can consider it as a null variable based on 3 condition.

If the variable is not set with any value.
If the variable is set with a null value.
If the value of the variable is unset.

Example 1

<?php
	 
	$empty=null;
var_dump($empty);
?>

Example 2

<?php
    	$a1 = " ";
   	 var_dump($a1);
    	echo "<br />";
    	$a2 = null;
    	var_dump($a2);
?>

Example 3

<?php
	$x = NULL;
	var_dump($x);
	echo "<br>";
	$y = "Hello javatpoint!";
	$y = NULL;
	var_dump($y);
?>

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Resource Data type:

Example 1

Example 2

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