This is a sample on how you could achieve that. It has to be added in the footer.php
COPY CODE
<?php
$bg = array('bg-01.jpg', 'bg-02.jpg', 'bg-03.jpg', 'bg-04.jpg', 'bg-05.jpg', 'bg-06.jpg', 'bg-07.jpg' ); // array of filenames
$i = rand(0, count($bg)-1); // generate random number size of the array
$selectedBg = "$bg[$i]"; // set variable equal to which random filename was chosen
?>
<style type="text/css">
<!--
body{
background: url('<?php get_stylesheet_directory_uri(); ?> /images/<?php echo $selectedBg; ?>') no-repeat;
}
-->
</style>
Images must be placed in sweetdate-child/images and defined in the $bg array
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