is_executable

说明

bool is_executable ( string filename )

如果文件存在且可执行则返回 TRUE。

is_executable() 自 PHP 5.0.0 版起可用于 Windows。

例子 1. is_executable() 例子
<?php $file = '/home/vincent/somefile.sh'; if (is_executable($file)) { echo $file.' is executable'; } else { echo $file.' is not executable'; } ?>

注: 本函数的结果会被缓存。更多信息参见 clearstatcache()。

提示: 自 PHP 5.0.0 起本函数也可被某些 URL wrapper 使用。参考附录 L 来看哪些 wrapper 支持 stat() 系列函数的功能。

参见 is_file() 和 is_link()。

add a note User Contributed Notes

Buuyo
06-Aug-2004 06:51


The change doesn't appear to be documented, so I thought I would mention it. In php5, as opposed to php4, you can no longer rely on is_executable to check the executable bit on a directory in 'nix. You can still use the first note's method to check if a directory is traversable: 

     @file_exists("adirectory/.");

david at littlesystems dot com dot au
02-Jun-2002 02:38


to test whether the directory /home/david is executable (regardless of whether it is readable or writeable), issue the command:

$my_isWriteable = @file_exists("/home/david/.")



the @ gets rid of the warning when this command fails when the directory is not executable.

drtebi at hotmail dot com
10-Feb-2001 12:12


[Editor's Note: This is the expected behavior (at least on most Unix-like systems).  If a directory is not executable, then you cannot get details on the files in the directory - this includes the permissions.





--zak@php.net]





This does not work on directories! 


look at this example:





if(is_file("foo/bar"))


  print "found it";





if "bar" exists, but directory "foo" is not executable, you will NOT get "found it" as result.

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