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    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。

    示例

    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 或 .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 或 .cmd 的非空文件都被视为可执行文件。注意 PATHEXT 与 is_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
    13
    Shyammakwana.me
    8 years ago
    For windows users,

    It will return TRUE for EXE extensions. I have checked for MSI, but it returns FALSE.
    up
    5
    divinity76 at gmail dot com
    5 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
    2
    nick at NOSPAM dot ogredata dot com
    4 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
    telezhkin at gmail dot com
    5 years ago
    Find no mention of this, but is_executable returns result for owner permissions only (not for group or other).
    up
    -1
    Anonymous
    4 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.
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