PHP 5.6 - 函数is_dir（）权限问题

Question

I'm trying to scan folders recursively and store every *.h file found's path into an array.

function findfiles($input, &$array){
    $dir = scandir($input);

    foreach($dir as $file)
    {   
        if ($file !== "." && $file !== "..")
        {
            if (is_file(realpath($file)) && substr($file, -2) === ".h")
            {
                array_push($array, realpath($file));
            }

            if (is_dir(realpath($file)) //I'M EVEN USING ABSOLUTE PATH
            {
                findfiles(realpath($file), $array); 
            }
        }
    }
}

$input="./"
$array = array();
findfiles($input, $array);

I guess this should work but function is_dir() returns FALSE for directories "./atest/AA" and "./atest/FolderInside" even if I have all permissions set.

drwxrwxrwx 2 root root 0 úno 14 18:46 AA
drwxrwxrwx 2 root root 0 úno 14 15:12 FolderInside

and works great with other folders "atest" and "test1" even they have the same permissions set.

drwxrwxrwx 2 root root    0 úno 14 18:46 atest
drwxrwxrwx 2 root root    0 úno 14 15:39 test1

Please why?

Answer 1

The thing is you cannot use just $file when calling is_file() or is_dir(), because it would search the file in include_path (possibly also in current directory). The correct way would be to prepend filename with pathname:

function findfiles($input, &$array){
    if (substr($input, -1) !== '/')
        $input .= '/';
    $dir = scandir($input);

    foreach($dir as $file)
    {   
        if ($file !== "." && $file !== "..")
        {
            if (is_file($input.$file) && substr($input.$file, -2) === ".h")
            {
                array_push($array, realpath($input.$file));
            }

            if (is_dir($input.$file))
            {
                findfiles($input.$file, $array); 
            }
        }
    }
}

$input="./";
$array = [];
findfiles($input, $array);