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PHP Interview Questions

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PHP is one of the most popular languages to develop dynamic Web pages. It supports all major database servers, including: MySQL, MS SQL Server, Oracle, mSQL, Sybase, etc.

If you are developing a Web application that uses PHP and needs to access MS SQL Server, you should go download and install PHP to your local machine to practice PHP and SQL Server connection. The best way to download and install PHP on Windows systems is to:

* Go to http://www.php.net, which is the official Web site for PHP.
* Click the Downloads menu link. You will see the PHP download page.
* Go to the "Windows Binaries" section, and click "PHP 5.2.3 zip package" link to download PHP binary version for Windows in ZIP format.
* Save the downloaded file, php-5.2.3-Win32.zip with 9,847,499 bytes, in C:Temp directory.
* Unzip the downloaded file into directory C:php.

You are done. No need to run any installation program.

PHP provides two execution interfaces: Command Line Interface (CLI) and Common Gateway Interface (CGI). If PHP is installed in the php directory on your system, you can try this to check your installation:

* Run "phpphp -v" command to check the Command Line Interface (CLI).
* Run "phpphp-cgi -v" command to check the Common Gateway Interface (CGI).

If you see PHP printing the version information on your screen for both commands, your installation is ok. Open a command window and run the commands below:

C:>phpphp -v
PHP 5.2.2 (cli) (built: May 2 2007 19:18:26)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0 Copyright (c) 1998-2007 Zend Technologies

C:>phpphp-cgi -v
PHP 5.2.2 (cgi-fcgi) (built: May 2 2007 19:18:25)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0 Copyright (c) 1998-2007 Zend Technologies

The best way to download and install PHP on Windows systems is to: 

  • Go to http://www.php.net, which is the official Web site for PHP.
  • Download PHP binary version for Windows in ZIP format.
  • Unzip the downloaded file into a directory.

You are done. No need to run any install program.

PHP stores configuration settings in a file called php.ini in PHP home directory. You can open it with any text editor to your settings.

A standard alone PHP script can be executed directly with the PHP Command Line Interface (CLI). Write the following script in a file called hello.php:
<?php echo "Hello world!"; ?>
This script can be executed by CLI interface like this:
phpphp hello.php
You should see the "Hello world!" message printed on your screen

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