تابع ‎ftruncate()‎‎ در PHP

<?php
// Check filesize
echo filesize("test.txt");
echo "<br>";

$file = fopen("test.txt", "a+");
ftruncate($file,100);
fclose($file);

// Clear cache and check filesize again
clearstatcache();
echo filesize("test.txt");
?>
<?php
// Check filesize
echo filesize("test.txt");
echo "<br>";

$file = fopen("test.txt", "a+");
ftruncate($file,100);
fclose($file);

// Clear cache and check filesize again
clearstatcache();
echo filesize("test.txt");
?>اجرای کد