convert dd-mm-yyyy to yyyy-mm-dd in mysql php

$date = DateTime::createFromFormat('d/m/Y', "24/04/2012");
echo $date-&gt;format('Y-m-d');

$var = '20/04/2012';
$date = str_replace('/', '-', $var);
echo date('Y-m-d', strtotime($date));

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