PHP log10() function

Complete PHP Math Reference

Definition and Usage

The log10() function returns the base-10 logarithm of a number.

Syntax

log10(x)

Tips and Notes

Note: If the parameter x is negative, -1.#IND is returned.

Example

In the following example we will use the log10() function on different numbers:

<?php
echo(log10(2.7183) . "<br />");
echo(log10(2) . "<br />");
echo(log10(1) . "<br />");
echo(log10(0) . "<br />");
echo(log10(-1))
?>

The output of the code above will be:

0.434297385125
0.301029995664
0
-1.#INF
-1.#IND

Complete PHP Math Reference

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