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Monday, January 21, 2019

php tutorial pdf free download for beginners with examples BIT UCSC UoM Colombo Sri Lanka Tamil Sinhala





1 GET and POST method in PHP There are two ways the browser client can send information to the web server. • The GET Method • The POST Method Before the browser sends the information, it encodes it using a scheme called URL encoding. In this scheme, name/value pairs are joined with equal signs and different pairs are separated by the ampersand. name1=value1&name2=value2&name3=value3 Spaces are removed and replaced with the + character and any other nonalphanumeric characters are replaced with a hexadecimal values. After the information is encoded it is sent to the server. The GET Method The GET method sends the encoded user information appended to the page request. The page and the encoded information are separated by the ? character. http://www.test.com/index.htm?name1=value1&name2=value2 • The GET method produces a long string that appears in your server logs, in the browser's Location: box. • The GET method is restricted to send upto 1024 characters only. • Never use GET method if you have password or other sensitive information to be sent to the server. • GET can't be used to send binary data, like images or word documents, to the server. • The data sent by GET method can be accessed using QUERY_STRING environment variable. • The PHP provides $_GET associative array to access all the sent information using GET method. Example Source Code: test.php "; echo "You are ". $_GET['age']. " years old."; exit(); } ?>
Name: Age:
GET and POST method in PHP 2 The POST Method The POST method transfers information via HTTP headers. The information is encoded as described in case of GET method and put into a header called QUERY_STRING. • The POST method does not have any restriction on data size to be sent. • The POST method can be used to send ASCII as well as binary data. • The data sent by POST method goes through HTTP header so security depends on HTTP protocol. By using Secure HTTP (https) you can make sure that your information is secure. • The PHP provides $_POST associative array to access all the sent information using GET method. Example Source Code: test.php "; echo "You are ". $_POST['age']. " years old."; exit(); } ?>
Name: Age:
The $_REQUEST Variable The $_REQUEST variable contains the contents of both $_GET, $_POST, and $_COOKIE. The PHP $_REQUEST variable can be used to get the result from form data sent with both the GET and POST methods. Example Source Code: test.php "; echo "You are ". $_REQUEST['age']. " years old."; exit(); } ?>
Name: Age:
GET and POST method in PHP 3 Here $_PHP_SELF variable contains the name of self script (test.php) in which it is being called. isset returns TRUE if variable exists and has value other than NULL, FALSE otherwise. Output of the above examples:

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