(PHP 4, PHP 5, PHP 7)
ftruncate — ���ļ��ضϵ������ij���
$handle
, int $size
) : bool
�����ļ�ָ�� handle ��Ϊ�����������ļ���С��ȡΪ
size��
handle�ļ�ָ�롣
Note:
The
handlemust be open for writing.
sizeThe size to truncate to.
Note:
If
sizeis larger than the file then the file is extended with null bytes.If
sizeis smaller than the file then the file is truncated to that size.
�ɹ�ʱ���� TRUE�� ������ʧ��ʱ���� FALSE��
| �汾 | ˵�� |
|---|---|
| 4.3.3 |
�� PHP 4.3.3 ֮ǰ��ftruncate() �ڳɹ�ʱ����һ��
integer ֵ 1�������� boolean �� TRUE��
|
Example #1 File truncation example
<?php
$filename = 'lorem_ipsum.txt';
$handle = fopen($filename, 'r+');
ftruncate($handle, rand(1, filesize($filename)));
rewind($handle);
echo fread($handle, filesize($filename));
fclose($handle);
?>
Note:
The file pointer is not changed.