What's wrong with my code? I wish to get all dates from but my array is empty.

<?php
$url = "http://weather.yahoo.com/";
$page_all = file_get_contents($url); 

preg_match_all('#<div id="myLocContainer">(.*)</div>#', $page_all, $div_array);

echo "<pre>";
print_r($div_array);
echo "</pre>";
?>

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