The **`hexdec` method** can be used to convert a `hexadecimal` string to a `decimal` number. 

#   
## Syntax

```
hexdec(string $hex_string): int|float
```
Any invalid characters in the `hex_string` argument are skipped. 
>From  PHP 7.4.0, any invalid character in `hex_string` is deprecated.


## Return value

It returns the decimal number of type `int` or `float` based on the size of the value.

## Code 

<?php 
  $num = "a";
  echo "HexaDecimal value of ". $num. " is: ". hexdec($num)."\n";

  $num = "b";
  echo "HexaDecimal value of ". $num. " is: ". hexdec($num)."\n";

  $num = "c";
  echo "HexaDecimal value of ". $num. " is: ". hexdec($num)."\n";

  $num = "f";
  echo "HexaDecimal value of ". $num. " is: ". hexdec($num)."\n";

?>

## Explanation 

In the code above, we used the `hexdec` method to convert the hexadecimal values of `a`, `b`, `c` and `f` into decimal numbers.

What is the hexdec method in PHP?

Converts hexadecimal strings to decimal numbers, ignoring invalid characters. Returns int or float.