- var_dump: documentation ( source)
- array_combine: documentation ( source)
<?php
$img_thumbs = array('folder/thumb1.jpg','folder/thumb2.jpg','folder/thumb3.jpg');
$img_links = array('folder/image1.jpg','folder/image2.jpg','folder/image3.jpg');
var_dump(array_combine($img_thumbs, $img_links));