(PHP 4, PHP 5, PHP 7)
ftruncate — 将文件截断到给定的长度
$handle
, int $size
)
接受文件指针 handle
作为参数,并将文件大小截取为
size
。
handle
文件指针。
Note:
The
handle
must be open for writing.
size
The size to truncate to.
Note:
If
size
is larger than the file then the file is extended with null bytes.If
size
is smaller than the file then the file is truncated to that size.
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
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.