PHP 8.3.0 RC 6 available for testing

eio_dup2

(PECL eio >= 0.0.1dev)

eio_dup2Duplicate a file descriptor

说明

eio_dup2(
    mixed $fd,
    mixed $fd2,
    int $pri = EIO_PRI_DEFAULT,
    callable $callback = NULL,
    mixed $data = NULL
): resource

eio_dup2() duplicates file descriptor.

参数

fd

Source stream, Socket resource, or numeric file descriptor

fd2

Target stream, Socket resource, or numeric file descriptor

pri

请求的优先级:EIO_PRI_DEFAULTEIO_PRI_MINEIO_PRI_MAXnull。如果是 nullpri 将设为 EIO_PRI_DEFAULT

callback

callback 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。

data

Arbitrary variable passed to callback.

返回值

eio_dup2() returns request resource on success, 或者在失败时返回 false.

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