تابع ‎floatval()‎‎ در PHP

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<?php
$a = "1234.56789";
echo floatval($a) . "<br>";

$b =  "1234.56789Hello";
echo floatval($b) . "<br>";

$c =  "Hello1234.56789";
echo floatval($c) . "<br>";
?>

floatval(variable);