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@ 2016-08-23T12:07:19Z

<?php

$year = date('Y');

$week_count = date('W', strtotime($year . '-12-31'));

if ($week_count == '01')
{   
    $week_count = date('W', strtotime($year . '-12-24'));
}

echo $week_count;

Output
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date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

40.54 ms | 402 KiB | 5 Q