Php/docs/function.eio-truncate
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eio_truncate
(PECL eio >= 0.0.1dev)
eio_truncate — Truncate a file
说明
eio_truncate
( string $path
[, int $offset = 0
[, int $pri = EIO_PRI_DEFAULT
[, callable $callback = NULL
[, mixed $data = NULL
]]]] ) : resource
eio_truncate() causes the regular file named by path to be truncated to
a size of precisely length bytes
参数
pathFile path
offsetOffset from beginning of the file.
pri请求的优先级:
EIO_PRI_DEFAULT,EIO_PRI_MIN,EIO_PRI_MAX或null。如果是null,pri将设为EIO_PRI_DEFAULT。callbackcallback函数在请求完成时被调用。其应匹配一下原型:void callback(mixed $data, int $result[, resource $req]);data传递给请求的用户数据。
result针对请求的结果的值。通常是相应的系统调用返回的值。
req可选的请求资源,可被 eio_get_last_error() 之类的函数使用。
dataArbitrary variable passed to
callback.