sqrt
(PHP 4, PHP 5, PHP 7, PHP 8)
sqrt — Square root
Description
sqrt(float
$num): float
Returns the square root of num.
Parameters
-
num -
The argument to process
Return Values
The square root of num
or the special value NAN for negative numbers.
Examples
Example #1 sqrt() example
<?php
// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>
See Also
- pow() - Exponential expression
M_SQRTPI-sqrt(pi)M_2_SQRTPI-2/sqrt(pi)M_SQRT2-sqrt(2)M_SQRT3-sqrt(3)M_SQRT1_2-1/sqrt(2)
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