php create file with given size

Question

Hello,
How can i create in PHP a file with a given size (no matter the content)

Mike

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I have to create a file bigger than 1GB. Arround 4-10GB maximum

Answer 1

You can make use of fopen and fseek

define('SIZE',100); // size of the file to be created.
$fp = fopen('somefile.txt', 'w'); // open in write mode.
fseek($fp, SIZE-1,SEEK_CUR); // seek to SIZE-1
fwrite($fp,'a'); // write a dummy char at SIZE position
fclose($fp); // close the file.

On execution:

$ php a.php

$ wc somefile.txt
  0   1 100 somefile.txt
$ 

Answer 2

If the content of the file is irrelevant then just pad it - but do make sure you don't generate a variable too large to hold in memory:

$fh=open("somefile", 'w');
$size=10245;
$chunk=1024;
while ($size>0) {
   fputs($fh, str_pad('', min($chunk,$size)));
   $size-=$chunk;
}
flcose($fh);

If the file has to be readable by something else - then how you do it depends on the other thing which needs to read it.

C.

Answer 3

Check this link

http://www.phpeasystep.com/phptu/3.html

You will get some idea in this.