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

> **Hexadecimal** is the base-16 number system and uses the digits from `0 to 9` and `A to F`.



#   
#  Syntax

```
dechex(int $num): string
```
##  
## Arguments

The argument is the decimal number to be converted to hexadecimal. 

The `dechex` method only handles the unsigned integers. If we pass negative integers that will be treated as unsigned integers.

The largest decimal value that can be converted to decimal in a 32-bit platform is ` PHP_INT_MAX * 2 + 1 (or -1)`. 

## Return value

It returns the hexadecimal value of the argument as a string.

## Code 

<?php 
  $num = 15;
  echo "hexadeciaml value of ". $num. " is: ". dechex($num)."\n";

  $num = 16;
  echo "hexadeciaml value of ". $num. " is: ". dechex($num)."\n";

  $num = 100;
  echo "hexadeciaml value of ". $num. " is: ". dechex($num)."\n";

  $num = 999;
  echo "hexadeciaml value of ". $num. " is: ". dechex($num)."\n";
?>

## Explanation 

In the code above, we have used the `dechex` method to convert the decimal numbers `15`, `16`, `100`,  and `999` into hexadecimal representations.

What is the dechex method in PHP?

Converts decimal numbers to unsigned hexadecimal strings using base-16, digits 0-9 and A-F.