fgets the first bytes of file

[skullj]

Hello,

i want to downloading the first bytes of files temporary on my server to get some information of file.

The function that i am using is fopen to read the file_to_read and then the fgets to save temporary in file_to_write.txt .

Sometimes the file_to_read is very big and i get an error so i want to save the first 4096 bytes from file_to_read to file_to_write.txt .

This the code that im using

$handle = @fopen("$file_to_read", "r");
clearstatcache();
ignore_user_abort(true); 
if ($handle) {
    while (!feof($handle)) {
        $buffer = fgets($handle, 2048);

   $filename = 'file_to_write.txt';

   if (is_writable($filename)) {

      if (!($handle2 = fopen("$filename", "w+"))) {
            echo "Cannot open file ($filename)";
            exit;
       }

       if (fwrite($handle2, $buffer) === FALSE) {
           echo "Cannot write to file ($filename)";
           exit;
       }   
       fclose($handle2);
   }
    }
    fclose($handle);
}

any help?

[PeejAvery]

The following will get you the first 4096 bytes of any file. If you want to check the size before reading it, use filesize().

<?php
$path = 'example.txt';
$file = fopen($path, 'r');
$contents = fread($file, 4096);
fclose($file);
?>

[skullj]

I cant understand how can i use your code!

Can you edit mine?

[Zetas]

$handle = @fopen("$file_to_read", "r");
clearstatcache();
ignore_user_abort(true); 
if ($handle) {
        $buffer = fread($handle, 4096);

   $filename = 'file_to_write.txt';

   if (is_writable($filename)) {

      if (!($handle2 = fopen("$filename", "w+"))) {
            echo "Cannot open file ($filename)";
            exit;
       }

       if (fwrite($handle2, $buffer) === FALSE) {
           echo "Cannot write to file ($filename)";
           exit;
       }   
       fclose($handle2);
   }
    fclose($handle);
} 

The proper technique for what your doing is to use fread() instead of fgets().

I'm not sure what is in the file your trying to read, but if its binary data or plaintext thats all on one line, fgets() will take very long to execute and possibly not execute at all because it attempts to get "a line" from the file pointer. fread() just reads how many ever bytes from the beginning of the file you specify so it is not as intensive.

However fread() does not utilize the file pointer (keeping track of where it was last read/written) so it's not made for use in a loop.

Hope that helped.

-Zetas

[skullj]

It works!

Thank you