Php/docs/splfileobject.ftruncate
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SplFileObject::ftruncate
(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::ftruncate — Truncates the file to a given length
说明
public SplFileObject::ftruncate
( int $size
) : bool
Truncates the file to size
bytes.
参数
size
The size to truncate to.
Note:
If
size
is larger than the file it is extended with null bytes.If
size
is smaller than the file, the extra data will be lost.
返回值
成功时返回 true
, 或者在失败时返回 false
。
范例
Example #1 SplFileObject::ftruncate() example
<?php// Create file containing "Hello World!"$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