```
<?Php
echo LOG(2);// Output is 0.69314718055995
echo "<br>";
echo LOG(-1);// Output is NAN
echo "<br>";
echo LOG(0);// Output is -INF
echo "<br>";
echo LOG(5.7);// Output is 1.7404661748405
?>
```

Syntax
`LOG(X,Y);`

X is the input number with Base Y (optional) . We get output as LOG of X
```
<?Php
echo LOG(5,2);// Output is 2.3219280948874
echo "<br>";
echo LOG(5,10);// Output is 0.69897000433602
echo "<br>";
echo LOG(5,2.7183);// Output is 1.609427153552
?>
```

'e' is the base of the natural system of logarithms it's value is approximately 2.718282.
- What is the purpose of the
`log()`

function in PHP? - How is the
`log()`

function used to calculate the natural logarithm of a number? - What are the parameters of the
`log()`

function in PHP? - Can you specify a base other than
`e`

(natural logarithm) when using the`log()`

function? - How can you calculate the logarithm to a different base using the
`log()`

function? - Does the
`log()`

function produce an error if the input value is negative or zero? - What is the return value of the
`log()`

function when it is successful? - How can you handle cases where the
`log()`

function returns`false`

? - Can the
`log()`

function be used to calculate the logarithm of complex numbers? - Are there any alternative functions or libraries available in PHP for more advanced logarithmic calculations?

Math FunctionsLOG10() function LOG1P() function

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