使用readdir（）时排序输出

Question

I'm fairly new to PHP and have been using PHP's readdir() to look into a folder full of images and render them out dynamically based on how many images there are in that folder. Everything works great, but one thing I've noticed is that the images are not displayed in the order that they appear on my local machine HD.

So my question to anyone who knows PHP is, is there way of using PHP to read the contents of a folder AND display them in order without having to rename the actual file names eg 01.jpg, 02.jpg etc etc?

Answer 1

Have a look at the glob() function, it returns files alphabetically sorted by default:

$files = glob('/some/path/*.*');

Bonus, you can filter just images, and leave out directories.

Answer 2

readdir likely just takes the file system order. Which is alphabetical on NTFS, but seemingly random on most Unix filesystems. The documentation even says as much: »The entries are returned in the order in which they are stored by the filesystem.«

So you'd have to store the list in an array and sort that based on how you would like them to be sorted.

Answer 3

The php manual says:

string readdir ([ resource $dir_handle ] )
Returns the name of the next entry in the directory. The entries are returned in the order in which they are stored by the filesystem.

Meaning they should appear the same way.

More information found in the manual .

Answer 4

Why not apply one of the sort-functions of PHP ?

$files = readdir( $theFoldersPath );
sort( $files  );

Answer 5

Here is what I came up with in answer (together with the help of the people who posted) to my own question.

<?php 

$dir = "low res";
$returnstr = "";

// The first part puts all the images into an array, which I can then sort using natsort()
$images = array();

if ($handle = opendir($dir)) {
    while ( false !== ($entry = readdir($handle))) {
        if ($entry != "." && $entry != ".."){
            $images[] = $entry;
        }
    }
    closedir($handle);
}

natsort($images);
print_r($images);

$newArray = array_values($images);

// This bit then outputs all the images in the folder along with it's own name

foreach ($newArray as $key => $value) {
    // echo "$key - <strong>$value</strong> <br />"; 

    $returnstr .= '<div class="imgWrapper">';
    $returnstr .= '<div class="imgFrame"><img src="'. $dir . '/' . $value . '"/></div>';
    $returnstr .= '<div class="imgName">' . $value . '</div>';
    $returnstr .= '</div>';


}

echo $returnstr;
?>