PHP log1p() Function

The log1p() is an inbuilt PHP function that returns log(1+number), & when the value of the number is close to zero, then it will compute the way that will provide the accurate result.

Syntax:

log1p(float $num): float

Parameter: This function accepts only a single parameter:

• num: This parameter specifies the argument to the process.

Return value: This function returns log(1+number). The result will be in the floating point.

Example 1: The following example demonstrates the log1() function.

PHP

<?php

   echo log1p(33)."\n" ;
   echo log1p(33/2) ;
?>

Output:

3.5263605246162
2.8622008809295  

Example 2: The following example demonstrates the log1() function.

PHP

<?php

   echo log1p(99-50)."\n";
   echo log1p(100+2);
?>

Output:

3.9120230054281
4.6347289882296  

Reference: https://www.php.net/manual/en/function.log1p.php