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log

Name

log — Calculates the natural logarithm of a number.

Synopsis

float log(num);
float num: Value from which to get natural logarithm

Returns

Natural logarithm of a number

Description

Calculates the natural logarithm of the number given by num . log() is the opposite of the exp() function.

Version

PHP 3, PHP 4

See also

See also exp() , log10()

Example

Example 677. Calculate the natural logarithm of a number

$num = 54.5981;
echo "The natural log of $num is ",log($num),"\n";



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 http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ 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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