问php创建给定大小的文件

EN

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.

$ php a.php

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

<?php
$fh = fopen("somefile", 'w');
$size = 1024 * 1024 * 10; // 10mb
$chunk = 1024;
while ($size > 0) {
   fputs($fh, str_pad('', min($chunk,$size)));
   $size -= $chunk;
}
fclose($fh);

$size = 100;
$fp = fopen('foo.dat',"w+");
fwrite($fp,str_repeat(' ',$size),$size);

`truncate -s 10g foo.dat`;