php - Change background randomly when the page is refreshed -

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i have 10 image files in folder ( images ) named 1.jpg 10.jpg

what want change background randomly every time page refreshed

this have tried far : 

<body background='<?php echo 'images/'.rand(1,6).'.jpg' ?>'>

this doesn't work .

can tell me how using php, please ?

<script> $(function(){ var min = 1; var max = 6; var random = math.floor(math.random() * (max - min + 1)) + min; $("body").css("background-image","url(images/"+random+".jpg") }): </script>

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