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Our Testimonials |
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| 1. What is Difference between Abstract Class and Interface. |
| 2. What is difference between php4 and php5? |
| 3. What is Difference between GET and POST |
| 4. What's the difference between COPY OF A FILE & MOVE_UPLOAD_FILE in file uploading? |
| 5. How do you create subdomains using PHP? |
| 6. How can I maintain the count of how many persons have hit my site? |
| 7. What is meant by PEAR in php? |
| 8. What is the functionality of MD5 function in PHP? |
| 9. How can we know the number of days between two given dates using PHP? |
| 10. What is the difference between $message and $$message? |
| 11. How can I execute a PHP script using command line? |
| 12. What type of inheritance that php supports? |
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1. What is Difference between Abstract Class and Interface.
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Abstract Classes
An abstract class can provide some functionality and leave the rest for derived class
The derived class may or may not override the concrete functions defined in base class
The child class extended from an abstract class should logically be related
Interface
An interface cannot contain any functionality. It only contains definitions of the methods
The derived class must provide code for all the methods defined in the interface
Completely different and non-related classes can be logically be grouped together using an interface
In the interface all methods must be abstract; in the abstract class some methods can be concrete
interface contains variables that must be static and final; abstract class may contain non-final and final variables. members in an interface are public by default, abstract class may contain non-public members. interface is used to "implements"; whereas abstract class is used to "extends". |
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2. What is difference between php4 and php5?
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php4 cannot support oops concepts and zend engine1 will be used
in php5 support oops concepts and zends engine2 will be used
error supporting will increased in php5
xml and sqllite will be incresed in php5 |
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3. What is Difference between GET and POST
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GET:
1. URL Changes to the submitted script name, appended with a list
of each variable with the value.
2. Use only if the number of variable to be used in a form ar very less.
3. Never use GET forms when asking for login ID and passwords.
4. Even hidden variables are shown as a part of the URL.
5. A lot of webservers might complain about long URLs being submitted.
A lot of times a URL 255 char or more is a problem.
6. We can bookmark link with this method
POST:
1. This is the best way of submitting forms to the web server.
2. There is no limitation on the number of Variables passed from the form.
3. This is a transparent way of transmitting variables to the webserver
where hidden variable are always hidden!
4. We can not bookmark page link |
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4. What's the difference between COPY OF A FILE & MOVE_UPLOAD_FILE in file uploading?
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Answer: Move : This function checks to ensure that the file designated by filename is a valid upload file (meaning that it was uploaded via PHP's HTTP POST upload mechanism). If the file is valid, it will be moved to the filename given by destination.
If filename is not a valid upload file, then no action will occur, and move_uploaded_file() will return FALSE.
Copy :Makes a copy of a file. Returns TRUE if the copy succeeded, FALSE otherwise. |
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5. How do you create subdomains using PHP?
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Answer: In you main httpd.conf, add the following line at the bottom:Include /path/to/subdomains.conf file name subdomains.conf@mkdir ( "/path/to/subdirectory/".$name );   $vhost = "   ServerAdmin yourname@yourserver.com   DocumentRoot /path/to/subdirectory/".$name." ... |
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6. How can I maintain the count of how many persons have hit my site?
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session_start();//error_reporting(E_ALL);
if(!isset($_SESSION['count'])){
$_SESSION['count']=0;
}else{
$_SESSION['count']++;
} |
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7. What is meant by PEAR in php?
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PEAR is the next revolution in PHP. This repository is bringing higher level programming to PHP. PEAR is a framework and distribution system for reusable PHP components. It eases installation by bringing an automated wizard, and packing the strength and experience of PHP users into a nicely organised OOP library. PEAR also provides a command-line interface that can be used to automatically install "packages"
PEAR is short for "PHP Extension and Application Repository" and is pronounced just like the fruit. The purpose of PEAR is to provide:
A structured library of open-sourced code for PHP users
A system for code distribution and package maintenance
A standard style for code written in PHP
The PHP Foundation Classes (PFC),
The PHP Extension Community Library (PECL),
A web site, mailing lists and download mirrors to support the PHP/PEAR community
PEAR is a community-driven project with the PEAR Group as the governing body. The project has been founded by Stig S. Bakken in 1999 and quite a lot of people have joined the project since then. |
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8. What is the functionality of MD5 function in PHP?
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string md5(string)
It calculates the MD5 hash of a string. The hash is a 32-character hexadecimal number. |
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9. How can we know the number of days between two given dates using PHP?
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Simple arithmetic:
$date1 = date('Y-m-d');
$date2 = '2006-07-01';
$days = (strtotime() - strtotime()) / (60 * 60 * 24);
echo "Number of days since '2006-07-01': $days"; |
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10. What is the difference between $message and $$message?
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Anwser:
$message is a simple variable whereas $$message is a reference variable. Example:
$user = 'bob'
is equivalent to
$holder = 'user';
$$holder = 'bob'; |
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11. How can I execute a PHP script using command line?
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ust run the PHP CLI (Command Line Interface) program and provide the PHP script file name as the command line argument. For example, "php myScript.php", assuming "php" is the command to invoke the CLI program.
Be aware that if your PHP script was written for the Web CGI interface, it may not execute properly in command line environment. |
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12. What type of inheritance that php supports?
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In PHP an extended class is always dependent on a single base class, that is, multiple inheritance is not supported. Classes are extended using the keyword 'extends'. |
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