无法使用json_encoded php数组的元素填充<div>

Question

This function worked previously (the last time I opened this project over a week ago), but now I can't seem to get it to work at all and I have no idea how to figure out what's going wrong! First, I'll diagram my file architecture in case my file paths are incorrect and causing my php to not even be called:

~/Sites
    proj1
        htdocs
            index.html
            ajax.php
            scripts
                java_script.js
            styles
                style_sheet.css
        includes
            scrapedImages
                .
                .
                .

Here's the JS function that uses AJAX to call a .php script:

function requestServer() {
    $.getJSON('/Users/aweeeezy/Sites/proj1/htdocs/ajax.php', function(data) {
        $.each(data, function(key, val) {
            var html = "<img src='/Users/aweeeezy/Sites/proj1/includes/scrapedImages/"+val+"' style='display:block;max-width:20px;max-height:20px;width:auto;height:auto' alt=null />"
            $('#puppy-box').prepend(html);
        });
    });
}

The line setting var html was <img src='...'+images[i]+"... when I first opened the project this morning, but I'm not sure why...I think because I was testing the site out, it was faster to only load a fraction of the images and used a for loop to cycle through only the first 10 or so pictures, hence the i index. Anyway, shouldn't it be data[i], or val[i]...or data[val]? I have no idea what's going on here.

Here's the ajax.php file that the JS function is trying to call:

<?php
    $images = scandir('/Users/aweeeezy/Sites/proj1/includes/scrapedImages/');
    /*foreach ($images as $key => $image) {
        if ($image == '.' || $image == '..') {
            unset($images[$key]);
        }
    }*/
    echo json_encode($images);
?>

I commented out the middle part because I wasn't sure if this was causing a complication. I tried putting both echo and print lines in here to see if the script is being called, but even if they are working, I can't really see them because they're being returned as data (I think) to the JS function that calls the script.

How do I even go about debugging this mess and get my girlfriend's valentine's day project back on track!