Php array to ajax var - php

Question

I have an opensliding side panel in wich I display content. I have a working example, but it works on an ajax var that I've put in. I would like to scan a folder for the files loaded in my ajax code. How can I pass folder content into my ajax?
PHP
<div class="standorte-wrapper">
<div class="panel left"><!-- start pannel left -->
<div class="pan-item tl">
<button class="show-hide" data-ajaxFile="0">OPEN</button>
</div>
<div class="pan-item tr">
<button class="show-hide" data-ajaxFile="1">OPEN</button>
</div>
<div class="pan-item bl">
<button class="show-hide" data-ajaxFile="2">OPEN</button>
</div>
<div class="pan-item br">
<button class="show-hide" data-ajaxFile="3">OPEN</button>
</div>
</div><!-- end pannel left -->
<div id="open" class="panel right"><!-- start sliding pannel right -->
<div class="close-button">
close
</div>
<div id="content">
<div id="php-content"></div>
</div>
</div>
</div>
AJAX
$(document).ready(function() {
var ajaxUrls = [
'/standorteContent/brauerstrasse.php',
'/standorteContent/gutterstrasse.php',
'/standorteContent/kauffmannweg.php',
'/standorteContent/konradstrasse.php'
];
var ajaxFiles = [];
for (var i = 0; i < ajaxUrls.length; i++) {
$.ajax({
method: 'GET',
url: ajaxUrls[i],
success: function(data) {
//console.log(data);
ajaxFiles.push(data);
}
});
}
$('.adres-wrap > button').on('click', function() {
if ($('.panel.left').hasClass('open')) {
//alert('already open');
} else {
$('.panel.left').addClass('open', 1000, "easeInBack");
$('.standorte-wrapper').addClass('expand');
}
$('#php-content').html(ajaxFiles[$(this).attr('data-ajaxFile')]);
setTimeout(function (){
$('.panel.right div').fadeIn(400);
}, 500);
});
$('#close').on('click', function() {
$('.panel.right div').fadeOut(400);
setTimeout(function (){
$('.panel.left').removeClass('open');
$('.standorte-wrapper').removeClass('expand');
}, 500);
});
});
LOOKS LIKE
QUESTION
How can I change so that I don't have to add data-ajaxFile="nr" manual for every button? And I would like ajaxUrls get the path for php files only in a directory on my server. Can anyone help me out on this one?