posix_eaccess
(PHP 8 >= 8.3.0)
posix_eaccess — Determine accessibility of a file
说明
posix_eaccess() checks the effective user's permission of a file
参数
-
filename -
The name of a file to be tested.
-
flags -
A mask consisting of one or more of
POSIX_F_OK,POSIX_R_OK,POSIX_W_OKandPOSIX_X_OK.POSIX_R_OK,POSIX_W_OKandPOSIX_X_OKrequest checking whether the file exists and has read, write and execute permissions, respectively.POSIX_F_OKjust requests checking for the existence of the file.
返回值
成功时返回 true， 或者在失败时返回 false。
更新日志
| 版本 | 说明 |
|---|---|
| 8.3.0 | Checks the effective user/group for a file, differing from posix_access() which checks from the real user/group. |
示例
示例 #1 posix_eaccess() example
This example will check if the $file is readable and writable, otherwise will print an error message.
<?php
$file = 'some_file';
if (posix_eaccess($file, POSIX_R_OK | POSIX_W_OK)) {
echo 'The file is readable and writable!';
} else {
$error = posix_get_last_error();
echo "Error $error: " . posix_strerror($error);
}
?>注释
参见
- posix_get_last_error() - Retrieve the error number set by the last posix function that failed
- posix_strerror() - Retrieve the system error message associated with the given errno
- posix_access() - Determine accessibility of a file
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