is_executable

(PHP 4, PHP 5, PHP 7, PHP 8)

is_executable判断给定文件名是否可执行

说明

is_executable(string $filename): bool

判断给定文件名是否可执行。

参数

filename

文件的路径。

返回值

如果文件存在且可执行则返回 true,错误时返回 false。在 POSIX 系统中,如果设置了文件权限的可执行位,则文件可执行。对于 Windows,请参阅下面的注释。

错误/异常

失败时抛出 E_WARNING 警告。

范例

示例 #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';
}

?>

注释

注意: 此函数的结果会被缓存。参见 clearstatcache() 以获得更多细节。

小技巧

自 PHP 5.0.0 起, 此函数也用于某些 URL 包装器。请参见 支持的协议和封装协议以获得支持 stat() 系列函数功能的包装器列表。

注意: 在 Windows 上,如果文件是 Win API GetBinaryType() 报告的正确可执行文件,则该文件视为可执行文件;由于 BC 原因,扩展名是 .bat.cmd 的文件也被视为可执行文件。在 PHP 7.4.0 之前,任何扩展名是 .bat.cmd 的非空文件都被视为可执行文件。注意 PATHEXTis_executable() 无关。

参见

  • is_file() - 判断给定文件名是否为一个正常的文件
  • is_link() - 判断给定文件名是否为一个符号连接

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User Contributed Notes 5 notes

up
12
Shyammakwana.me
6 years ago
For windows users,

It will return TRUE for EXE extensions. I have checked for MSI, but it returns FALSE.
up
2
nick at NOSPAM dot ogredata dot com
2 years ago
This function returns the value for the process PHP is executing under.

/var/somebody/files was only executable by owner (700).

It contained world-readable files, but without execute permission, PHP could not access the directory to download the files.

is_executable() returned false.

Making the dir world-executable (701) gave access to PHP.  The download worked. And is_executable() returned true.

I assume that if I added PHP to the group of the folder and gave the group executable permission, that would also work.
up
1
Anonymous
2 years ago
Under windows, it seems to returns always false for directories.

I.e

<?php
$dir
= __DIR__;
$result = is_executable($dir) ? 'true' : 'false';

if(
$result){
  echo
$result;
}
?>

So do NOT use this to check if a folder is transversable because it will be system dependant code.
up
1
divinity76 at gmail dot com
3 years ago
is_executable() does not check the PATH environment variable, so if your current working dir is /dir/ and you have /bin/ in your PATH env and the file /bin/ffmpeg exists, then you can still run shell_exec("ffmpeg"), but is_executable("ffmpeg") will return false.

if you're looking for a version of is_executable that also considers the PATH environment variable, then try this:

<?php

function is_executable_pathenv(string $filename): bool
{
    if (
is_executable($filename)) {
        return
true;
    }
    if (
$filename !== basename($filename)) {
        return
false;
    }
   
$paths = explode(PATH_SEPARATOR, getenv("PATH"));
    foreach (
$paths as $path) {
        if (
is_executable($path . DIRECTORY_SEPARATOR . $filename)) {
            return
true;
        }
    }
    return
false;
}
up
-1
telezhkin at gmail dot com
3 years ago
Find no mention of this, but is_executable returns result for owner permissions only (not for group or other).
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