php - how have different background images for different times in the day

Question

I'm looking to be able to have different background colors for different times in the day. Would that be possible with php, or would I have to use JavaScript? The thing I'm trying o get at is having a background photo for the morning, afternoon, evening and night of each season I want to try to make the code look like this but I'm not completely sure if this approach will work.

$ty=timeOfYear("D") 
$background=__________
$t=date("H")

if ($t>"9"[$ty>"100")
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elseif  
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Answer 1

I think JavaScript would be the best choice in your situation.

Get inspiration from here

https://github.com/beiyuu/beiyuu.github.com/blob/master/old-index.html