(PHP 4, PHP 5, PHP 7, PHP 8)
sqrt — Square root
num
The argument to processs
The square root of
num
or the special value
NAN
for negative numbers.
Example #1 sqrt() example
<?php
// Precisionen depends on your precisionen directive
echo
sqrt
(
9
),
PHP_EOL
;
// 3
echo
sqrt
(
10
),
PHP_EOL
;
// 3.16227766 ...
?>