posix_access()

(PHP 5 >= 5.1.0, PHP 7)

Determine accessibility of a file

说明

posix_access() checks the user's permission of a file.

参数

The name of the file to be tested.

A mask consisting of one or more of POSIX_F_OK,POSIX_R_OK,POSIX_W_OK and POSIX_X_OK.

POSIX_R_OK,POSIX_W_OK and POSIX_X_OK request checking whether the file exists and has read, write and execute permissions, respectively.POSIX_F_OK just 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。

范例

posix_access() example

This example will check if the $file is readable and writable, otherwise will print an error message.

注释

Note:当启用安全模式时，PHP 会检查被操作的文件或目录是否与被执行的脚本有相同的 UID（所有者）。

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

It should be noted that this function performs access checks based on the real UID and real GID of the process running PHP. These aren't necessarily the same as the effective UID and GID.
In other words, it may well be that access() returns “true” for a particular permission, but an fopen() operation which requires the same permission will fail, and vice versa.
Keep that in mind if you use access() for such checks.

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