php array strtotime query -

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i have following code finds oldest date in array, , displays 'available now' if date today or earlier, or 'mixed availability' if date in future.

im trying modify if 1 valid date (not null or 1970-01-01 being imported if date blank) found in array, display date, or if date today or before today display 'available now'... id appreciate help! many in advance!

<?php $avail = array($this->item->extrafields->roomonedateavailable->value, $this->item->extrafields->roomtwodateavailable->value, $this->item->extrafields->roomthreedateavailable->value, $this->item->extrafields->roomfourdateavailable->value, $this->item->extrafields->roomfivedateavailable->value, $this->item->extrafields->roomsixdateavailable->value, $this->item->extrafields->roomsevendateavailable->value, $this->item->extrafields->roomeightdateavailable->value, $this->item->extrafields->roomninedateavailable->value, $this->item->extrafields->roomtendateavailable->value); $avail = array_filter($avail); $avail = min($avail); if (strtotime($avail) < time()) { ?><div class="pr-rd-avl-n">available<br /> now</div> <?php } else { ?><div class="pr-rd-avl-m">mixed<br /> availability</div> <?php } ?>


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