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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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Subject: PHP

Q:

How many types of Inheritances used in php and how we achieve it?

Answer

As far PHP concern it only support single Inheritance in scripting. we can also use interface to achieve multiple inheritance.

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Subject: PHP

Q:

What are the different functions in sorting an array?

Answer

sort() , rsort(), asort()
ksort()   , usort()
arsort()  , uksort()
natsort() , natcasesort()
array_multisort()

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Subject: PHP

Q:

What is the difference between the functions unlink and unset?

Answer

unlink()-deletes the given file from the file system.
unset() -makes a variable undefined.

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Subject: PHP

Q:

How we get IP address of client,previous reference page etc?

Answer

By using $_SERVER['REMOTE_ADDR'], $_['HTTP_REFERER'] etc.

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Q:

What is the use of header() function in php?

Answer

The header() function sends a raw HTTP header to a client. We can use header() function for redirection of pages. It is important to notice that  header()  must be called before any actual output is seen..

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Subject: PHP

Q:

What is difference between MyISAM and InnoDB storage engines in mysql.

Answer

1 : InnoDB provides us row level locking while MyISAM provides us table level locking.

2 : InnoDB offers foreign key constraints wheres in MyISAM does not have foreign key constraints.

3 : InnoDB does not have full text search wheres MyISAM provides us full text search.

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Subject: PHP

Q:

What is a .htacces file

Answer

 .htaccess is a configuration file running on Apache server.These .htaccess file used to change the functionality and features of apache web  server .

 e.g   .htaccess file used for url rewrite .

         .htaccess file used to make the site password protected.

         .htaccess file can restrict  some ip addresses ,so that on restricted ip adresses  site will not open.

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Subject: PHP