calculate date from day of year in php

gistfile1.php

<?php $todayid = date("z");  // to get today's day of year
 
function dayofyear2date( $tDay, $tFormat = 'd-m-Y' ) {
    $day = intval( $tDay );
    $day = ( $day == 0 ) ? $day : $day - 1;
    $offset = intval( intval( $tDay ) * 86400 );
    $str = date( $tFormat, strtotime( 'Jan 1, ' . date( 'Y' ) ) + $offset );
    return( $str );
}
 
echo dayofyear2date($todayid);

// Read more @author http://www.iamboredsoiblog.eu/2008/11/01/calculate-date-from-day-of-year-in-php/