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<?php
$last_week = false;
function is_last_week() {
    $days_left = date('t') - date('j');
    if ( 7 > $days_left ) :
        $last_week = true;
    endif;
    return $last_week;
}

<?php
include ('is_last_week.php');
if ( is_last_week() ) :
  echo 'We are in the last week of the month';
else :
  echo 'We havent reached the last week yet this month.';
endif;