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PHP Programing language

Write a Program to enter any number square a number
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<html>
<head>
<title>Square of numbers</title>
</head>
<body>
<?php
$a;
for($a=1; $a<=5; $a++)
$a=sqrt($a)*sqrt($a);
{
echo(sqrt($a) . "<br />");
}
?>
</body>
</html>
output
2.4494897427832
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