PHP log1p() Function

The log1p() function is predefined php math function which returns log(1+number). It computes accurate even when the value of $number is close to zero.

Syntax:

Parameter	Description	Required/Optional
Number	Specify the number to process	Required

Example1

<?php
$num=6;
echo "Your number is: ".$num;
echo "<br>"."By using log10() function your number is : ".log1p($num);
?>

Output:

Your number is: 6
By using log10() function your number is : 1.9459101490553

Example2

<?php
$num=(-0.3);
echo "Your number is: ".$num;
echo "<br>"."By using log10() function your number is : ".log1p($num);
?>

Output:

Your number is: -0.3
By using log10() function your number is : -0.35667494393873

Example3

<?php
$num=(2.7183);
echo "Your number is: ".$num;
echo "<br>"."By using log10() function your number is : ".log1p($num);
?>

Output:

Your number is: 2.7183
By using log10() function your number is : 1.3132665745863

Example4

<?php
$num=0;
echo "Your number is: ".$num;
echo "<br>"."By using log10() function your number is : ".log1p($num);
?>

Output:

Your number is: 0
By using log10() function your number is : 0

Next TopicPHP Math

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PHP log1p() Function

Syntax:

Example1

Example2

Example3

Example4

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