如何通过php在x86系统上制作具有所需大小的空文件

Question

I wnat to make an empty file with desired size on windows server 2003 x86 by php. A file larger than 2GB example 2.67Gb - 2870348740 bytes.

I use this code but makes a file with size of 1.89GB - 2040109466 bytes.

What I must do now ?

$size = 2870348740;
$fp = fopen('fileLocation/test.x', 'wb'); // open in write mode.
$eachpart = floor(1.9 * 1024*1024*1024); // 1.9 Gbyte to byte
$parts = ceil($size/$eachpart);
for ($i=0; $i<$parts; $i++){
    if ($i == $parts-1) $offset = $size - (($parts-1)*$eachpart) -1;
    else $offset = $eachpart;

    fseek($fp, $offset ,SEEK_CUR); // seek from current position
}
fwrite($fp,0); // write a dummy char at SIZE position
fclose($fp);

Answer 1

You can simply do this

file_put_contents('mybigfatfile.txt', str_repeat("\0",2*1024*1024*1024));

---

Update

you can build the string also on x86 system with

$kb = str_repeat("\0",1024);
$mb = str_repeat($kb,1024);
$gb = str_repeat($mb,1024);
file_put_contents('mybigfatfile.txt', str_repeat($gb,2));

Answer 2

I extended @gafreax solution and maked this code and problem solved.

thanks to @gafreax .

function makeFile($size,$dest){
    $eachpart = 100 * 1024*1024; // 100Mb
    $parts = ceil($size/$eachpart);
    for ($i=0; $i<$parts; $i++){
        if ($i == $parts-1) $offset = $size - (($parts-1)*$eachpart);
        else $offset = $eachpart;

        file_put_contents($dest, str_repeat("\0",$offset),FILE_APPEND);
    }
}