Method to check Size of Remote File

alex.zeal · 09-20-2007, 02:03 PM

Hello dear friends, I wanna know the method to check the size of targeted url... In other words if I wanna download a file "example.rar" from url "http://example.com/prg/rip/example.rar" I wanna chk the size of "example.rar" with help PHP code. And also wanna apply same code on all extensions like .zip, .rar, .mpg, .jpg, .htm, .tar or any other. Is it possible with any method...:)

Wildhoney · 09-20-2007, 02:17 PM

Sometimes the remote server will return you the Content-Length in the HTTP header. However, failing that, the way I would do it is:

PHP Code:


			
$szFile = file_get_contents('http://www.google.co.uk/intl/en_uk/images/logo.gif');
echo round(strlen($szFile) / 1024, 2) . 'KB';

This is assuming that all the characters are 1 byte a piece. 2 byte characters, such as Japanese characters, will give a bad reading, but you should be fine.

Needless to say that the Content-Length in the header is the way forward because the file doesn't need to be downloaded first - this is fine though with smallish files.

alex.zeal · 09-21-2007, 11:51 PM

Dear tht I think u don't got my point I actually wanna the size of file for example 'exaple.rar' file is of size 2mb... I want help in code so that when I enter url for instance imagine 'www.exmpl.com/as/example.rar' in a text box then after clicking submit button it return the size of the 'example.rar' or generate error message if url is not valid...

I think HTTP Header help out in this problem but I don't know how to Print it....

PHP Code:


			
$szFile = file_get_contents('http://www.google.co.uk/intl/en_uk/images/logo.gif');

echo round(strlen($szFile) / 1024, 2) . 'KB';

Dear I think this code help to get the size of url string not the targeted gif file. I wanna the size of gif file...

Chaos King · 09-22-2007, 12:29 AM

This is what you are talking about, at least this is what I can infer from your posts.

PHP Code:


			
function getSize ( $url )

{

    if ( intval(phpversion()) < 5 )

        die ( 'PHP5 Required' );

    

    $headers = get_headers ( $url, 1 );

    return $headers['Content-Length'];

}



echo getSize ( 'http://www.google.com/images/firefox/fox1.gif' );

You will need PHP5 in order for this function to operate, you can use a php4 replacement, you would have to find the function or write it yourself at http://php.net/get_headers in the comments section.

It gets the headers of the file, which does not download the file itself (this will make it faster than using file_get_contents

Was this what you had in mind?

Wildhoney · 09-22-2007, 10:22 AM

That's the function - get_header() !