PHP Questions

Q:

What is the functionality of md5 function in PHP?

Answer

Calculate the md5 hash of a string. The hash is a 32-character hexadecimal number. I use it to generate keys which I use to identify users etc. If I add random no techniques to it the md5 generated now will be totally different for the same string I am using.

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Q:

Why many companies are switching their current business language to PHP? Where PHP basically used?

Answer

PHP is rapidly gaining the popularity and many companies are switching their current language for this language. PHP is a server side scripting language. PHP executes the instructions on the server itself. Server is a computer where the web site is located. PHP is used to create dynamic pages and provides faster execution of the instructions.

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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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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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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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Q:

How to store the uploaded file to the final location?

Answer

move_uploaded_file( string filename, string destination)

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Q:

How can we know the number of days between two given dates using php?

Answer

<?php
$tomorrow = mktime(0, 0, 0, date("m") , date("d")+1, date("Y"));
$lastmonth = mktime(0, 0, 0, date("m")-1, date("d"), date("Y"));
echo ($tomorrow-$lastmonth)/86400;
?>

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Q:

What are encryption functions in PHP?

Answer

CRYPT(), MD5()

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