gz functions help required

[phpprogrammer]

Dear Friend,

I am having a file catalogue_en.xml.gz which is having the size of 4 MB
when I tried to unzip it by using the following code I am getting the unzipped file as 2GB.

<?php

$zp = gzopen("catalogue_en.xml.gz", "r");
$fp=fopen("catalogue_en.xml","w");
            $contents='';

while (!gzeof($zp)) 
{  $contents .= gzread($zp, 8192);
  fwrite($fp,$contents); 
}

fclose($fp);
gzclose($zp);

?>

if I unzip the file by using tools I am getting a file of size 26MB.

why I am getting 2GB size file while I am using php

suggestions/solutions required

regards,
bvsureshbabu

[jmelnick]

Hello bvsureshbabu,

The reason that your file grows to 2 GB is the logic in this while statement:

while (!gzeof($zp))
{ $contents .= gzread($zp, 8192);
fwrite($fp,$contents);
}

should be

while (!gzeof($zp))
{ $contents = gzread($zp, 8192);
fwrite($fp,$contents);
}

as $contents grows larger each iteration of the loop.

Joseph Melnick
JM Web Consultants
http://www.jphp.com/

[bradgrafelman]

Exactly. Right now, let's say you have this:

"this is
the contents of
my file
that i am
writing."

The first iteration of your while loop writes this:

"this is"

The second loop, due to your concatenation, writes this:

"this is the contents of"

And the third:

"this is the contents of my file"

So right now, your destination file reads like so:

"this isthis is the contents ofthis is the contents of my file"

😛

[phpprogrammer]

Dear Friends,

Thanks for your solutions

regards,
bvsureshbabu