(PHP 8 >= 8.3.0)
posix_fpathconf — Returns the value of a configurable limit
$file_descriptor, int $name): int|false
Returns the value of a configurable limit from name for a file descriptor resource
fdThe 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.
In almost all cases, you will want to provide a file resource.
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
Returns the configurable limit or false.
Throws a ValueError
when resource is invalid.
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