(PHP 4, PHP 5, PHP 7)
ftruncate — 锟斤拷锟侥硷拷锟截断碉拷锟斤拷锟斤拷锟侥筹拷锟斤拷
$handle
, int $size
) : bool
锟斤拷锟斤拷锟侥硷拷指锟斤拷 handle 锟斤拷为锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥硷拷锟斤拷小锟斤拷取为
size锟斤拷
handle锟侥硷拷指锟诫。
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.
锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷
| 锟芥本 | 说锟斤拷 |
|---|---|
| 4.3.3 |
锟斤拷 PHP 4.3.3 之前锟斤拷ftruncate() 锟节成癸拷时锟斤拷锟斤拷一锟斤拷
integer 值 1锟斤拷锟斤拷锟斤拷锟斤拷 boolean 锟斤拷 TRUE锟斤拷
|
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.