PHP – 获取有关图像(高度和宽度)的信息而不加载它

我有这个代码从目录中获取图像.我回显了图像的url并用JS获取它.

<?php

    $directory = "./images/photos/";
    $sub_dirs = glob($directory . "*");
    $i = 0;
    $len = count($sub_dirs);
    foreach($sub_dirs as $sub_dir)
    {
        $images = glob($sub_dir . '/*.jpg');
        $j = 0;
        $len_b = count($images);
        foreach ($images as $image) 
        {

            if ($j == $len_b - 1) {
                echo $image;
            } else {
                echo $image . "|";
            }

            $j++;

        }

        if ($i == $len - 1) {
        } else {
            echo "|";
        }
        $i++;
    }

?>