(PHP 4, PHP 5, PHP 7, PHP 8)
ftruncate — Truncates a file to a given length
$stream, int $size): bool
Takes the filepointer, stream, and truncates the file to
length, size.
streamThe file pointer.
Note:
The
streammust 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.
Returns true on success or false on failure.
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.