在PHP中按从新到旧的日期短显示图像

您看过USort吗：http://php.net/manual/en/function.usort.php它允许您使用用户定义的比较函数按值对数组进行排序。

示例

<?php
function my_sort($a,$b)
{
if ($a==$b) return 0;
   return ($a<$b)?-1:1;
}
$a=array(4,2,8,6);
usort($a,"my_sort");
$arrlength=count($a);
for($x=0;$x<$arrlength;$x++)
   {
   echo $a[$x];
   echo "<br>";
   }
?>

顺便说一句，我尝试实现您提供的示例，它为所有图像显示相同的日期：

# SETTINGS
$per_page = 6;
$page = $_GET['page'];
$has_previous = false;
$has_next = false;


function getPictures() {

    global $page, $per_page, $has_previous, $has_next;
    if ( $handle = opendir("saved/2013") ) {
        $lightbox = rand();
        $count = 0;
        $skip = $page * $per_page;

        if ( $skip != 0 )
            $has_previous = true;

        while ( $count < $skip && ($file = readdir($handle)) !== false ) {
            if ( !is_dir($file) && ($type = getPictureType($file)) != '' )
                $count++;
        }
        function my_sort($a,$b)
        {
        if ($a==$b) return 0;
           return ($a<$b)?-1:1;
        }
        $count = 0;
        while ( $count < $per_page && ($file = readdir($handle)) !== false ) {
            if ( !is_dir($file) && ($type = getPictureType($file)) != '' ) {
                if ( ! is_dir('saved/2013') ) {
                    mkdir('saved/2013');
                }
                $a=array($file);
                usort($a,"my_sort");

                //$strFileName = "saved/2013/".$file;
                $strFileName = "saved/2013/".$a[$x];
                echo '<div id="imagen-t">';
                //echo '<p>' .date( "D d M Y g:i A", filemtime($strFileName)) . "</p>";
                echo '<p>' .date( "D d M Y g:i A", filemtime($strFileName)) . "</p>";
                echo '<p><a href="saved/2013/'.$file.'" rel="lightbox['.$lightbox.']"><img src=saved/2013/'.$file.' alt="" width="220" /></a></p>';
                echo '</div>';
                $count++;
            }
        }

        while ( ($file = readdir($handle)) !== false ) {
            if ( !is_dir($file) && ($type = getPictureType($file)) != '' ) {
                $has_next = true;
                break;
            }
        }
    }
}