ftruncate()
ftruncate() — Truncates a file to a given length.
Built-in function of PHP 8.5. The manual lists it as available in PHP 4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.
What it does
Takes the filepointer, stream, and truncates the file to length, size.
Signature
ftruncate(resource $stream, int $size): bool
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $stream | resource | The file pointer. |
| $size | int | The size to truncate to. |
Return value
Returns true on success or false on failure.
Example
A runnable snippet:
$filename = 'lorem_ipsum.txt'; $handle = fopen($filename, 'r+'); ftruncate($handle, rand(1, filesize($filename))); rewind($handle); echo fread($handle, filesize($filename)); fclose($handle);
See also
All PHP 8.5 built-in functions
Reference card built from the PHP manual page ftruncate() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.