PHP ftruncate () function
Complete PHP Filesystem Reference Manual Definition and Usage
ftruncate () function to open the file is truncated to the specified length.
If successful it returns TRUE, on failure returns FALSE.
grammar
ftruncate(file,size)
| 参数 | 描述 |
|---|---|
| file | 必需。规定要截断的打开文件。 |
| size | 必需。规定新的文件大小。 |
Examples
<?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");
?>
//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");
?>
The code above will output:
792
100
100
Complete PHP Filesystem Reference Manual