**“e”**as its base, while

**log10**employs the base

**10**. These functions provide a convenient way to calculate logarithmic values in PHP and find solutions to various problems.

This guide will provide you a detail of the **log()** function in PHP with examples.

**PHP log() Function**

The **log()** function is a built-in PHP function that allows you to calculate the natural log of different numbers. When using this function in PHP, you have the option to pass two arguments; the first one is the **“number”** that is used to specify the value for which you want to calculate the logarithm. The second argument is the **“base”** which is not mandatory but can be used to determine the base of the logarithm. If you skip the base argument, the function will assume the natural logarithm with base **“e”** by default.

To use** log()** function in PHP, you must follow the below-given syntax:

The above function returns the natural log of a number.

**Use log() Function in PHP**

Here are a few examples that describe the use of the **log()** function in PHP.

**Example 1**

In the following example, we are using the **log() function** to calculate the **natural log** of a specific number.

**Example 2**

You can also pass the base number in the **log() function**. The following sample code snippet explains the use of **log()** to find the logarithm of a provided number with a specific base:

$number = readline("Enter a number: ");

$base = readline("Enter the base: ");

echo "The log of $number with base $base is: " . log($number, $base);

?>

**Use log10() Function in PHP**

The **log10() function** in PHP is a pre-defined math function that returns the **base 10 logarithm** of the entered number. The following is the syntax for using **log10 **in PHP.

It accepts one compulsory parameter, a number to find the logarithm for.

**Example **

The **log10** of a number can be calculated in PHP using the following code:

**Bottom Line**

In PHP, the **log() function** is a helpful tool for developers who need to work with logarithmic functions. This function allows you to determine a number’s natural logarithm, which is helpful for a variety of online applications. You can also use the **log10 () function **of PHP to calculate the logarithm of base 10 in PHP.