(PHP 4, PHP 5)
sqrt — Square root
$arg
)
Returns the square root of arg.
arg
The argument to process
The square root of arg
or the special value NAN for negative numbers.
Örnek 1 sqrt() example
<?php
// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>