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<!DOCTYPE html>
<html>
<body>
<?php
$a = "1234.56789";
echo doubleval($a) . "<br>";
$b = "1234.56789Hello";
echo doubleval($b) . "<br>";
$c = "Hello1234.56789";
echo doubleval($c) . "<br>";
?>
</body>
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</html>
1234.56789
1234.56789
0