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Monday, 22 April 2013

PHP Sessions

02:05  ElearnSite  No comments

PHP Sessions A PHP session variable is used to store information about, or change settings for a user session. Session variables hold information about one single user, and are available to all pages in one application. PHP Session Variables When you are working with an application, you open it, do some changes and then you close it. This is much like a Session. The computer knows who you are. It knows when you start the application and when you end. But on the internet there is one problem: the web server does not know who you are and what you do because the HTTP address doesn't maintain state. A PHP session solves this problem by allowing you to store user information on the server for later use (i.e. username, shopping items, etc). However, session information...

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PHP require

01:58  ElearnSite  No comments

PHP require Just like the previous lesson, the require command is used to include a file into your PHP code. However there is one huge difference between the two commands, though it might not seem that big of a deal. require is identical to include except upon failure it will also produce a fatal E_COMPILE_ERROR level error. In other words, it will halt the script whereas include only emits a warning (E_WARNING) which allows the script to continue. require will produce a fatal error (E_COMPILE_ERROR) and stop the script. Syntax: require 'filename'; PHP Code: <?php require("noFileExistsHere.php"); echo "Hello World!"; ?> Display: Warning: main(noFileExistsHere.php): failed to open stream: No such file or directory...

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PHP $_GET & PHP $_POST

01:47  ElearnSite  No comments

 The $_GET Variable The predefined $_GET variable is used to collect values in a form with method="get" Information sent from a form with the GET method is visible to everyone (it will be displayed in the browser's address bar) and has limits on the amount of information to send. When using method="get" in HTML forms, all variable names and values are displayed in the URL. The get method is not suitable for very large variable values. It should not be used with values exceeding 2000 characters. ·   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...

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PHP File Upload

01:40  ElearnSite  No comments

PHP File Upload With PHP, it is possible to upload files to the server. A very useful aspect of PHP is its ability to manage file uploads to your server. Allowing users to upload a file to your server opens a whole can of worms, so please be careful when enabling file uploads. When the uploader.php file is executed, the uploaded file exists in a temporary storage area on the server. If the file is not moved to a different location it will be destroyed! To save our precious file we are going to need to make use of the $_FILES associative array. The $_FILES array is where PHP stores all the information about files. There are two elements of this array that we will need to understand for this example. ·        uploadedfile - uploadedfile...

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PHP File

01:35  ElearnSite  No comments

PHP File Handling The fopen() function is used to open files in PHP. Opening a File The fopen() function is used to open files in PHP. The first parameter of this function contains the name of the file to be opened and the second parameter specifies in which mode the file should be opened: <html> <body> <?php $file=fopen("welcome.txt","r"); ?> </body> </html> ·        The presentation of the file lessons will begin with how to create, open, and close a file. After establishing those basics, we will then cover other important file tasks, such as: read, write, append, truncate, and uploading files with PHP. ·        Manipulating files is a basic necessity for serious...

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PHP Calendar

01:28  ElearnSite  No comments

PHP Calendar Introduction ·        The calendar extension contains functions that simplifies converting between different calendar formats. ·        It is based on the Julian Day Count, which is a count of days starting from January 1st, 4713 B.C. ·        Note: To convert between calendar formats, you must first convert to Julian Day Count, then to the calendar of your choice. Installation For these functions to work, you have to compile PHP with --enable-calendar. The Windows version of PHP has built-in support for this...

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