PHP ftruncate() Function
Definition and Usage
The ftruncate() function truncates a file to the specified length.
Syntax
ftruncate(file,size)
| Parameter | Description |
|---|---|
| file | Required. Specify the opened file to be truncated. |
| size | Required. Specify the new file size. |
Description
Accepts a file pointer file As a parameter, and truncate the file size to size. If successful, it returns TRUE; otherwise, it returns FALSE.
Tips and Comments
Note:The file will only be changed in append mode. In write mode, it must be added fseek() Operation.
Note:Before PHP 4.3.3, ftruncate() returns an integer value 1 on success, not a boolean value TRUE.
Example
<?php
//Check file size
echo filesize("test.txt");
echo "<br />";
$file = fopen("test.txt", "a+");
ftruncate($file,100);
fclose($file);
//Clear cache, check file size again
clearstatcache();
echo filesize("test.txt");
?>
Output similar to:
792 100
