如何按修改日期对图像进行排序？

Question

此代码按字母顺序对图像进行排序。如何按日期排序？这样用户查看新图片会更方便。

代码如下：

<link href="assets/css/gallery.css" rel="stylesheet">
<link href="assets/css/dope.css" rel="stylesheet">
<div class="row center">
    <ul class="uk-tab" id="gamemodelistregion" uk-switcher="connect: + ul; animation: uk-animation-fade">
    <li aria-expanded="true" class="uk-active">
        <a>All skins</a>
        <?php
            # Skin directory relative to include/gallery.php (this file)
            $skindir = "../skins/";

            # Skin directory relative to index.html
            $skindirhtml = "./skins/";

            $images = scandir($skindir);

            foreach($images as $curimg) {
                if (strtolower(pathinfo($curimg, PATHINFO_EXTENSION)) == "png") {
        ?>
        <li class="skin" onclick="$('#nick').val('{' + $(this).find('.title').text() + '} ');" data-dismiss="modal">
            <div class="circular" style='background-image: url("./<?php echo $skindirhtml.$curimg ?>")'></div>
            <h4 class="title"><?php echo pathinfo($curimg, PATHINFO_FILENAME); ?></h4>
        </li>
        <?php
                }
            }
        ?>
    </li>
</ul>
</div>

Answer 1

filemtime 函数返回文件最后修改日期的 Unix 时间戳。

// retrieve all images but don't waste time putting them in alphabetical order
$images = scandir($skindir, SCANDIR_SORT_NONE);

// remove all non-existent files and non-PNG files
$images = array_filter($images,
  function($file) use ($skindir) {
    $path = "$skindir/$file";
    return file_exists($path) && strtolower(pathinfo($path, PATHINFO_EXTENSION)) == "png";
  }
);

// sort image by modification time in descending order
usort($images, function($a,$b){return filemtime($a)-filemtime($b);});

// now you can iterate through images and print them
foreach($images as $curimg): ?>
  <!-- Output image HTML here -->
<?php
endforeach;