(PHP 5 >= 5.1.0)
SplFileObject::ftruncate — Truncates the file to a given length
Truncates the file to size bytes.
The size to truncate to.
Nota: If size is larger than the file it is extended with null bytes.
If size is smaller than the file, the extra data will be lost.
Retorna TRUE em caso de sucesso ou FALSE em falhas.
Exemplo #1 SplFileObject::ftruncate example
<?php
// Create file containing "Hello World!"
$file = new SplFileObject("/tmp/ftruncate", "w+");
$file->fwrite("Hello World!");
// Truncate to 5 bytes
$file->ftruncate(5);
// Rewind and read data
$file->rewind();
echo $file->fgets();
?>
O exemplo acima irá imprimir algo similar a:
Hello