September 2001
Intermediate to advanced
768 pages
32h 45m
English
Content preview from PHP Functions Essential Reference
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sqrt
float sqrt(float num) Returns the square root of the given argument.
Returns:
Square root of a number; NAN for negative values
Description:
sqrt() returns the square root of a number. This function returns the string NAN (for Not a Number) when given a negative value in num .
Version:
PHP 3, PHP 4
See also:
pow()
Example:
Calculate the square root of a number
$org = 25; echo "The square root of $org is ", sqrt($org); |
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