PHP Programming

PHP is a server side scripting language. PHP is used to develop web applications which has interaction between the Web Application and the Users.

PHP developers write the programs (Server side scripting) to develop these web applications. The developed programs acts as an intermediary between the users and the web servers and database. For example when you purchase something online, say a book from amazon.com or ebay.com the order creation, online payments for the orders and upto the delivery of the items, all these transactions are done through the server side scripting languages called PHP. And PHP developers develop this type of websites and applications.

Note: The websites given - amazon.com and ebay.com may use a different Server Side Scripting languages than PHP and just for a example and user reference it is given above.

This question is too vague to answer properly. If you are using server side processing to execute scripts on the server or access database information, it is essential. If you are using it strictly for the include feature, it depends on the size of your website.

SSI saves you time when updating common elements on each page of your website, but the creation and maintenance of the included files can be difficult and time consuming. Since the included files are usually incomplete code snippets, many editors and browsers will not handle them properly. This can restrict you to using something like notepad to maintain your site. If you want to view your results you will either have to upload them to a server first or run server software on your local PC.

If your site is only a few pages, the extra hassle is not worth it, if it is huge, it is worth it. The crossover point is up to you.

Download & Install a WAMP or XAMPP Server and everything you require to code in php comes with them. If you want to secure wamp or xampp you ought to change the php.ini file and mysql config files and change password for mysql and php localhost

Rasmus Lerdorf is a Danish-Greenlandic programmer and most notable as the creator of the PHP programming language. PHP began in 1994 as a set of Common Gateway Interface binaries that Lerdorf wrote in C to replace Perl scripts he had been using on his personal homepage. Lerdorf has been an Infrastructure Architecture Engineer at Yahoo! since 2002.

No. However, PHP must be on your computer to process the PHP commands. You will also need a web server program like Apache.

A simple way to do this is to go to http://www.apachefriends.org/en/xampp.html and all the programs you need can be installed on your computer to run PHP, plus a MYSQL database, in case you want to really get into working with PHP.

Once the PHP and Apache are installed you can access your PHP web pages through your browser from your Apache "localhost" directory after storing your new PHP files there. No internet connection needed.

In a database table, the INSERT INTO statement is used to insert new rows. Let's create a SQL query with acceptable values using the INSERT INTO statement, and then run it by passing it to the PHP mysqli query() function to insert data into the table.

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PHP is a cross platform programming language, it is (in theory) available on any operating system.

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Yes, Apache Tomcat supports the installation and usage of PHP (of any version below 5, not including 5). See the related links for an official Tomcat-PHP installation guide.

PHP generally is used to program the back end of websites. The parts that deal with databases and users/passwords, any program that stores information. It is used for most programs on websites today, it is completely server-side, unlike JavaScript or HTML which are interpreted by the web browser on the client-side. The server reads PHP which generally tells it what HTML or JavaScript to display to the browser. When you submit a form it may be handled by PHP as well. So for any sort of interactive website, or a site that needs a database or administration section PHP programming is essential. I may be slightly bias as I am a PHP programmer. One other thing, PHP among many other uses is also used for inter-changeable templates on websites, that is with the click of a button the website's template changes.

Websites are servers that present pages as they are requested. Pages, in this context, are merely different kinds of files -- much like images and word documents.

The "php" appended at the end of a URL indicates you are requesting a PHP type file, which is composed with the PHP language.

PHP is a programming language that stands for "PHP: Hypertext Preprocessor." It is used to develop websites that present dynamic content and allow page-to-page interaction, such as forums and wikis.

Their interfaces are self-describing

They can be used to tinegrate legacy systems

They can interoperate across programming language and platform boundaries

They open the e-marketplace to multiple systems

They provide a hightly secure mechanism for accessing third-pary code

There are many options to encode and encrypt PHP source code, the most common one being Zend Guard. However it must be noted that using any encryption method will require that the server on which the application is run to have the correct extension to decrypt and decode the PHP source code.

An alternative to encryption is to compile to bytecode. Bytecode is used as intermediate by the compiler, so it has no problem using it, and it provides a little speed boost (one step is already completed). Bytecode is less secure because the code is not encrypted, but simply rendered into a format hard to read for humans but native to computers.

There are lots of benefits of using PHP over ASP

Hosting is cheap and as I can think off

1. Because of free OS available that is Linux

2. Web server is free

3. Database is free (MySQL) and gels with it very well

4. As OS is Linux you don't pay any anti virus cost

5. Language is easy to learn and lots of resources available

Do you have an index.php file in the root folder ? This is a common cause of failure. In some case, copy index.html to index.php resolve the problem. If you have index.php, you may need to supply debugging during staging (e.g. set BP_DEBUG option).

The standard way to open a block of PHP (escaping it from HTML) is with the tag.

You must start with double quotes to get expanded variables, then escape nested ones with backslash

Or use single quotes inside double

Notice you don't need to quote single dimensional array indexes inside the square braces if inside double quotes

To display your own defined error message in php simply echo error message.

To see errro message while query execution simply do mysql_error();

Or so enable syntax error and warnings use error_reporting(1) in the beggining of script.

Suppose you have checkbox in HTML from and and you are calling that checkbox by name in php , In that case in you don't check and hit submit , You will get Undefined parameter 'name_of _checkbox' As Error.

When data is POSTed to a PHP script, you may access them from the $_POST super global variable.

A basename is a file name without any path or directory information.

When scripting in PHP, you always want to open up the script with a tag and close it with a ?>tag.

PHP files are HTML files with any amount of PHP intermingled into it, so the file can be empty or only contain HTML and be valid, yes.