How do you capture audio or video in PHP?

FFMPEG or FFMPEG_PHP is used to record, convert and stream audio and video. It includes libavcodec, the leading audio or video code library. FFMPEG or FFMPEG_PHP is developed under Linux, but it can compiled under most operating systems, including Windows.

Difference between COPY and MOVE_UPLOAD_FILE function in php?

Copy Makes a copy of a file. Returns TRUE if the copy succeeded otherwise return FALSE.

move_uploaded_file() function checks to ensure that the file designated by filename is a valid upload file. 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.

How do we know browser properties?

get_browser() is used to determine the browser properties. you can check browscap.ini file.

$browser = get_browser();
foreach ($browser as $name => $value) {
echo “<b>$name</b> $value <br />\n”;
}

What is CAPTCHA images?

CAPTCHA will generate an image containing string of numbers and letters. this is to prevent spammers. So many programmers can create curl script which attach your form and fill junk data and send mail to you. Using bots which can fill forms automatically. If you use captcha then bots will not identify the string or numbers. By entering the numbers and letters from the image in the validation field, the application can be assured that this is not spam.

How do you know whether the recipent of your mail had checked the mail or not?

Having the html email to execute a Javascript segment may be too much.  But embed an URL in a say 0-byte image tag may be the better way to go.  In other word, you embed a invisible image on your html email and when the src URL is being rendered by the server, you can track whether your recipients have view the emails or not.

What are magic quotes in PHP?

Some special characters in PHP like, single quote( ‘ ), double quote( ” ), amperson ( & ) etc. are escape by slash its called magic quotes. Its useful for beginner programmer.

What is the use of obj_star?

Well, its initializing the object buffer, so that the whole page will be first parsed (instead of parsing in parts and thrown to browser gradually) and stored in output buffer so that after complete page is executed, it is thrown to the browser once at a time.

How do you create subdomains using PHP?

–> Create the appropriate web root directory,
for example /home/sites/username/web, and any subdirectories   you wish
–> Edit httpd.conf -  add a new virtual host section
–> Restart httpd
In a normal Linux server setup, php/Apache does not have the necessary permissions to do all this.

How do i limit the no of rows 1 get out of my database?

– LIMIT

eg: select * from ‘tablename’ where ‘condition’ LIMIT 1;

How can i fetch only the unique values in mysql?

– through DISTINCT function.

eg: select DISTINCT ‘fieldname’ from ‘tablename’ where ‘condition’