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 PHP Questions

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Q:

What is PHP's mysqli Extension?

Answer

The mysqli extension , or as it is sometimes known, the MYSQL improved extension ,was developed to take advantage of new features found in MYSQL systems versions 4.1.3 and later.

The mysqli extension has a number of benfits,the key enhancements over the mysql extension being:
=> Object-oriented interface
=> Support for prepared statements
=> Support for multiple statements
=> Support for transactions
=> Enhanced debugging capabilities
=> Embedded server support

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Q:

With a heredoc syntax, do I get variable substitution inside the heredoc contents?

Answer Yes
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Q:

Would you initialize your strings with single quotes or double quotes?

Answer Since the data inside the single-quoted string is not parsed for variable substitution, it’s always a better idea speed-wise to initialize a string with single quotes, unless you specifically need variable substitution.
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Q:

What is Apache configuration file typically called?

Answer

The Apache configuration file is called httpd.conf.

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Q:

Describe how to create a simple AD rotator script without using database in PHP.

Answer

Following are the steps to create a simple AD rotator script without using database in PHP:


- All the ad’s can be collected in one place and be displayed randomly.rand() function can be used for this purpose.


- In order to NOT use any database, a flat file can be used to store the ad’s.


- In order to store the Ad’s information (HTML code), a flat file say “ad.txt” can be created.


- The random number can be stored in a variable 


$result_random=rand(1, 100);


- Conditions can be checked to display the ad’s.


if($result_random<=70)


{


      echo "Display ad1";


}

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Q:

How can we get the browser properties using PHP?

Answer

By using
$_SERVER['HTTP_USER_AGENT']
variable.

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Q:

So if md5( ) generates the most secure hash, why would you ever use the less secure crc32( ) and sha1( )?

Answer Crypto usage in PHP is simple, but that doesn’t mean it’s free. First off, depending on the data that you’re encrypting, you might have reasons to store a 32-bit value in the database instead of the 160-bit value to save on space. Second, the more secure the crypto is, the longer is the computation time to deliver the hash value. A high volume site might be significantly slowed down, if frequent md5() generation is required.
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Q:

What Is a Session in PHP?

Answer

A PHP Session persist the user information to be used later. For example, user name, password, shopping item details. The session is temporary and will be removed soon after the user has left the web site. The session can be persisted for long term usage on databases like MySQL. Each session is identified by a unique Id number for every visitor. The first step to use PHP session is to start the session. The starting session must precede the operations like HTML or the other.


The statement session_start() starts the PHP session and registers the user’s information on the server.

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