sqrt
sqrt
Square root
float **sqrt** float $num
Returns the square root of .
num
numThe argument to process
The square root of
or the special value for negative numbers.
num``NAN
Voorbeeld: example
<?php
// Precision depends on your precision directive
echo sqrt(9), PHP_EOL; // 3
echo sqrt(10), PHP_EOL; // 3.16227766 ...
?>
pow``M_SQRTPI``sqrt(pi)``M_2_SQRTPI``2/sqrt(pi)``M_SQRT2``sqrt(2)``M_SQRT3``sqrt(3)``M_SQRT1_2``1/sqrt(2)