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PHP log() Function

< PHP Math Reference

Example

Return the natural logarithm of different numbers:

<?php
echo(log(2.7183) . "<br>");
echo(log(2) . "<br>");
echo(log(1) . "<br>");
echo(log(0);
?>

Definition and Usage

The log() function returns the natural logarithm of a number, or the logarithm of number to base.

Syntax

log(number,base);

Parameter	Description
number	Required. Specifies the value to calculate the logarithm for
base	Optional. The logarithmic base to use. Default is 'e'

Technical Details

Return Value:	The natural logarithm of a number, or the logarithm of number to base
Return Type:	Float
PHP Version:	4+
PHP Changelog:	PHP 4.3: The base parameter were added

< PHP Math Reference