# posix_fpathconf

(PHP 8 >= 8.3.0)

posix_fpathconf — Returns the value of a configurable limit

### 说明

posix_fpathconf(resource|int `$file_descriptor`, int `$name`): int|false

Returns the value of a configurable limit from `name` for `file_descriptor`.

### 参数

`file_descriptor`

  The file descriptor, which is expected to be either a file resource or an int. An int will be assumed to be a file descriptor that can be passed directly to the underlying system call.

`name`

  The name of the configurable limit, one of the following. `POSIX_PC_LINK_MAX`, `POSIX_PC_MAX_CANON`, `POSIX_PC_MAX_INPUT`, `POSIX_PC_NAME_MAX`, `POSIX_PC_PATH_MAX`, `POSIX_PC_PIPE_BUF`, `POSIX_PC_CHOWN_RESTRICTED`, `POSIX_PC_NO_TRUNC`, `POSIX_PC_ALLOC_SIZE_MIN`, `POSIX_PC_SYMLINK_MAX`.

### 返回值

Returns the configurable limit or `false`.

### 错误／异常

Throws a ValueError when `resource` is invalid.

### 示例

示例 #1 posix_fpathconf() example

This example will get the max path name's length in bytes for the current dir.

`<?php
$fd = fopen(__DIR__, "r");
echo posix_fpathconf($fd, POSIX_PC_PATH_MAX);
?>`

以上示例会输出：

    4096

### 参见

- posix_pathconf() - Returns the value of a configurable limit

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