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(PHP 5 >= 5.1.0)
SplFileObject::ftruncate — Truncates the file to a given length
$size
)
Truncates the file to size
bytes.
size
The size to truncate to.
Note:
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.
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
Example #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 ();
?>
以上例程的输出类似于:
Hello