按自然顺序排序图像？

This is my block of PHP.

<?php

I know that this is where the array is defined.

$string =array();
$dir = opendir($filePaththumb);
while ($file = readdir($dir)) {
    if (eregi("\.png",$file) || eregi("\.jpg",$file) || eregi("\.gif",$file) ) {
    $string[] = $file;
    }
}

I assume I should use natsort() before the code continues beyond this point.

echo "<b><font size='$font_size'>".$gallery_name."</font></b><br>";
$loop = "0";
while (sizeof($string) != 0){
    $img = array_pop($string);

Can I use natsort() here?

    echo "<center><a href='$filePath$img' download='$filePath$img' target='$target_thumb'><img src='$filePaththumb$img' border='0' width='100%'/><BR><IMG src='img/download.png'></a><BR><BR><BR><BR></center>";
    $loop = $loop + 1;
    if ($loop == $loop_end) {
        echo "<br>";
        $loop = "0";
    }
}

?>

How can I sort images in natural order?

after you have created your $string[] array you can now sort it.

It will be sorted in place i.e. you don't have to assign a result to another variable, the natsort() function will return true or false (on failure).

while ($file = readdir($dir)) {
    if (eregi("\.png",$file) || eregi("\.jpg",$file) || eregi("\.gif",$file) ) {
        $string[] = $file;
    }
}
//print_r($string);
natsort($string);
//print_r($string);

// then display them in order;
foreach ($string as $img){
    echo "<img ...";
    ...
}

Thanks everyone for you input! Your suggestions helped me greatly!

<?php

$string =array();
$dir = opendir($filePaththumb);
while ($file = readdir($dir)) {
    if (eregi("\.png",$file) || eregi("\.jpg",$file) || eregi("\.gif",$file) ) {
    $string[] = $file;

After the Array has been filled with .jpg/.gif/.png files, I used

natsort($string); to arrange the image files in the $string array in Natural Order

I also used array_reverse($string); to arrange the order of the image files from filename of greatest Natural Order value to descending Natural Order of value.

    }
}

echo "<b><font size='$font_size'>".$gallery_name."</font></b><br>";
$loop = "0";
while (sizeof($string) != 0){
    $img = array_pop($string);    
    echo "<center><a href='$filePath$img' download='$filePath$img' target='$target_thumb'><img src='$filePaththumb$img' border='0' width='100%'/><BR><IMG src='img/download.png'></a><BR><BR><BR><BR></center>";
    $loop = $loop + 1;
    if ($loop == $loop_end) {
        echo "<br>";
        $loop = "0";
    }
}

?>

Thanks again everyone!