hypot()
The hypot() function returns the length of the hypotenuse of a right-angle triangle.

Syntax
hypot(x,y)

Example
<?php
echo hypot(2,3) . "<br />";
echo hypot(3,6) . "<br />";
echo hypot(3,6) . "<br />";
echo hypot(1,3);
?>

The output of the code above will be:

3.60555127546
6.7082039325
6.7082039325
3.16227766017

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Sureshbabu Harikrishnan
+91 9884320017