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PhpDig is a PHP MySQL based
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sqrt — Returns the square root of the given argument.


float sqrt(num);
float num: Number from which to derive square root


Square root of a number; NAN for negative values


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 .


PHP 3, PHP 4

See also

See also pow()


Example 692. Calculate the square root of a number

$org = 25;
echo "The square root of $org is ", sqrt($org);

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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