Introduction to php web programming - get and post
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Introduction to php web programming - get and post
- 1. Introduction to PHP Web programming Week 11, day2
- 3. PHP with HTML âą You can embed PHP code inside html: <html> <body> <h1> <?php $str_one = "Helloo World!"; echo $str_one; ?> </h1> </body> </html> âą Or you can call html from php: <?php echo "<html><body><h2>Helloo Baabtra</h2></body></html>â; ?>
- 4. Client - Server communication with Form Data
- 5. When you submit the form- all form element data(username and password ) will be send to the file âregistration.phpâ which is residing on your server HTML Form Example
- 6. HTML Form Example Action specifies where to send the form data? Normally we specify a page which resides on server so that all form data will be sent to that page. In this example when you click submit button data you entered will be send to âregistation.phpâ
- 7. HTML Form Example We can send data to server in two ways GET or POST.
- 8. Form action and methods âąThere are two methods that we can send form data from client to server âą GET âą Allows you to send data as part of the query string.That means data will be appended with the url âąhttp://example.org/index.php?list=user&orderby=name&direction=asc âą POST ïAllows the client to send along a data payload, for example, if you are posting an HTTP form, the payload could consist of the form data, while if you are uploading a file, the payload would consist of the file itself. Payload will be with HTTP request so that it will not be visible to the user
- 9. Comparison âą Data sent will be shown in the URL âą Size of Data can be send is limiter normally ~2kb but its browser dependant âą Cannot be used to send binary data like image or document âą Bookmarking is possible with GET method âą Data will not be shown with the browser âą No restrictions on size of data âą Can be used to send files âą Book marking is not possible with POST method GET POST
- 10. How will you get that data in âregistration.phpâ ??? âą All the form data sent via Get method will be stored in a super global Array $_GET âą Eg: http://example.org/index.php?list=user&orderby=name&direction=asc echo $_GET*âlistâ+; âą You can create arrays by using array notation... Eg: http://example.org/index.php?list=user&order[by]=column&order[dir]=asc âąand then access them using the following syntax: echo $_GET*âorderâ+*âbyâ+; echo $_GET*âorderâ+*âdirectionâ+;
- 11. How will you get that data in âregistration.phpâ ??? âą Similarly all the form data sent via POST method will be stored in a super global array $_POST âąEg: echo $_POST*ânameâ+; // will output baabtra echo $_POST*âemailâ+; // will output info@baabtra.com
- 12. When You Donât Know How Data Is Sent âą If you want to receive data send by client browser but you donât know the method they used to send (GET or POST), you can do this by using $_REQUEST[] super global array âą ie. $_REQUEST[] will contain what ever data you send in any method either GET or POST. âą Eg: echo $_REQUEST*ânameâ+;
- 13. Try this âą Create a HTML form as below . Try both Get and POST methods âą Up on clicking submit button it should display what user have entered localhost/test/Registration.php Baabtra info@baabtra.com localhost/test/Registration.php
- 15. File Uploading âą File uploads are an important feature for many Web applications; âą A file can be uploaded through a âmulti-partâ HTTP POST transaction. <form enctype="multipart/form-data" action="index.phpâ method="post"> <input type="hidden" name="MAX_FILE_SIZE" value="50000" /> <input type="file" name="filedata" /> <input type="submit" value="Send file" /> </form>
- 16. File Uploading âą File uploads are an important feature for many Web applications; âą A file can be uploaded through a âmulti-partâ HTTP POST transaction. <form enctype="multipart/form-data" action="index.phpâ method="post"> <input type="hidden" name="MAX_FILE_SIZE" value="50000" /> <input type="file" name="filedata" /> <input type="submit" value="Send file" /> </form> is an encoding type that allows files to be sent through a POST. Quite simply, without this encoding the files cannot be sent through POST.
- 17. File Uploading âą File uploads are an important feature for many Web applications; âą A file can be uploaded through a âmulti-partâ HTTP POST transaction. <form enctype="multipart/form-data" action="index.phpâ method="post"> <input type="hidden" name="MAX_FILE_SIZE" value="50000" /> <input type="file" name="filedata" /> <input type="submit" value="Send file" /> </form> MAX_FILE_SIZE value is used to define the maximum file size allowed (in this case, 50,000 bytes)
- 18. File Uploading âą File uploads are an important feature for many Web applications; âą A file can be uploaded through a âmulti-partâ HTTP POST transaction. <form enctype="multipart/form-data" action="index.phpâ method="post"> <input type="hidden" name="MAX_FILE_SIZE" value="50000" /> <input type="file" name="filedata" /> <input type="submit" value="Send file" /> </form> Tip :You can limit the amount of data uploaded by a POST operation by modifying number of configuration directives in php.ini, such as post_max_size, max_input_time and upload_max_filesize.
- 19. How will you receive the file at server side? âą Once a file is uploaded to the server, PHP stores it in a temporary location and makes it available to the script; It is up to the script to move the file to a safe location. The temporary copy is automatically destroyed when the script ends. âą Inside your script, uploaded files will appear in the $_FILES super global multi dimensional array. This array will have the following keys â name : The original name of the file â type : The MIME type of the file provided by the browser â size : The size (in bytes) of the file â tmp_name : The name of the fileâs temporary location â error : The error code associated with this file. A value of UPLOAD_ERR_OK indicates a successful transfer
- 20. Built in functions for file upload() âą is_uploaded_file(filename) : returns true if the file has uploaded to the temporary location in server âą Accepts and argument âfilenameâ which refers to the name of the file in servers temporary position.ie it will be $_FILE*âfilenameâ+*âtmp_nameâ+ âą move_uploaded_file(source,destination) : to move an uploaded file to a different location âą Source refers to its current location which obviously is in the temporary location in the server ie $_FILE*âfilenameâ+*âtmp_nameâ+ âą Destination refers to where to move the file along with its name eg. âimages/profilePics/â. $_FILE*âfilenameâ+*ânameâ+
- 21. form enctype="multipart/form-data" action=âregister.phpâ method="post"> <input type="file" name="filedata" /> <input type="submit" value="Send file" /> </form> Example â File Upload Index.html
- 22. <?php echo $_FILE*âfiledataâ+*ânameâ+; // prints the name of file uploaded echo $_FILE*âfiledataâ+*âsizeâ+; // prints the size of file uploaded is_uploaded_file($_FILE*âfiledataâ+*âtmp_nameâ+) { $target=âimages/â.$_FILE*âfiledataâ+*ânameâ+; move_upload_file($_FILE*âfiledataâ+*âtmp_nameâ+,$target); } ?> Example â File Upload Register.php
- 23. Questions? âA good question deserve a good gradeâŠâ
- 24. End of day
- 25. Contact Us Emarald Mall (Big Bazar Building) Mavoor Road, Kozhikode, Kerala, India. Ph: + 91 â 495 40 25 550 NC Complex, Near Bus Stand Mukkam, Kozhikode, Kerala, India. Ph: + 91 â 495 40 25 550 Start up Village Eranakulam, Kerala, India. Email: info@baabtra.com