Difference between Cookie and Session Method
| Slno. | Cookie | Session |
| 01. | A cookie is a bit of data stored by the browser and sent to the server with every request.Cookies are used to identify sessions. A cookie is mainly used to identify a user. A cookie is a small file that the server embeds on the client/user’s computer. Each time the same computer requests a page with a browser, it will send the cookie too. | A session is a way to store information (in the form of variables) to be used across multiple logged in pages.They’re normally protected by some kind of server-side security. |
| 02. | Cookies are stored on browser as text file format. | Sessions information are stored on server of a web site. |
| 03. | It stores limited amount of data. | It stores unlimited amount of data. |
| 04. |
It stores upto 4kb [4096 bytes] size.Normally size of cookie is limited to 40 and number of cookies to be used is restricted to 20. |
There is no limitation on the size or number of sessions to be used in an application. |
| 05. | It does not hold the multiple variables in cookies. | It holds the multiple variables in sessions. |
| 06. | We can access the cookies value easily. So it is less secure. | We cannot access the session values easily because it is stored in binary format/encrypted form and gets decrypted at server.So it is more secure. |
| 07. | We can set the cookie time to expire it. | Using session_destory() function, we can destroy the sessions. |
| 08. | The setcookie() function must appear before the html tag. | The session_start() function must be the very first thing in the html document. |
| 09. | Cookies may or may not be individual for every client. | Session is independent for every client i.e. individual for every client. |
| 10. | Cookies can be disabled. | We cannot disable the sessions. Sessions can be used without cookies also. |
| 11. | Cookies can store information only in “String” datatype format.Hence there is no security. | Session can store information in any type of data because the value is of data type of “object”. |
| 12. | Cookies are called as both persistent and non-persistent nature. | Sessions are called as non-Persistent because its life time can be set manually. |
| 13. | The disadvantage of session is that it is a burden or an overhead on server. |
Difference between Get and Post Method
| Slno. | GET | POST |
| 01. | The GET method is restricted to send upto 1024/2048 characters only but varies by browser and web server.. | The POST method does not have any restriction on data size to be sent.However, there is an 8 MB max size for the POST method, by default (can be changed by setting the post_max_size in the php.ini file) |
| 02. | The variable names and values will be visible in URL if HTML forms submitted by the GET method. | The variable names and values are invisible in URL if HTML forms submitted by the POST method. |
| 03. | only ASCII characters allowe i.e. GET method can’t be used, to send binary data like images and Word documents. | The POST method can be used to send ASCII as well as binary data. |
| 04. | GET method should not be used when sending passwords or other sensitive information. | POST method is secure to send passwords or other sensitive information. |
| 05. | GET method data can be accessed using PHP QUERY_STRING environment variable. | |
| 06. | PHP $_GET associative array is used to access all the sent information by GET method. | PHP $_POST associative array is used to access all the sent information by POST method. |
| 07. | Variables are visible in the URL so users can bookmark open page. | Variables are not visible in the URL so users can’t bookmark open page. |
| 08. | The data sent by GET method is visible, hence less secure. | The data sent by POST method goes through HTTP header, so security depends on HTTP protocol.Hence data is more secure. |
| 09. | Parameters remain in browser history because they are part of the URL | Parameters are not saved in browser history. |
| 10. | Can be cached | Not cached |
| 11. | Easier to hack for script kiddies | More difficult to hack |
| 12. | Encoding type is application/x-www-form-url encoded | Encoding type is multipart/form-data or application/x-www-form-url encoded. multipart encoding is used mainly for binary data. |
Difference between Include and Require Method
| Slno. | Include | Require |
| 01. | Insert the content of specified Php file into another Php file at required place one/more times. | Insert the content of specified Php file into another Php file at required place one/more times. |
| 02. | It produces a warning message (if it fails to locate the file) and continue to execute the remaining codes. | It throws a fatal error (if it fails to locate the file) and stops the further execution of the remaining codes. |
| 03. | Syntax=include ‘filename’; | Syntax=require ‘filename’; |
| 04. |
Example=include ‘abc.php’; Example=include “abc.php”; |
Example=require ‘abc.php’; Example=require “abc.php”; |
| 05. | It should be used mainly when the required file is not compulsory and application execution should continue when that file is not found. | It should be used only when the file is required/compulsory/must for an application. |
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