The **`octdec()` method** can be used to convert an octal string to a decimal number. 

#     
## Syntax

---
```
octdec(string $octal_string): int|float
```
---

## Parameters

* Any invalid characters in the `octal_string` argument are skipped.  
>From PHP 7.4.0, any invalid characters in `octal_string` are deprecated.

* The `octal_string` argument should be a type of string, otherwise unexpected results will be produced.

## Return value

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

<?php 
  $num = "70";
  echo "decimal value of ". $num. " is: ". octdec($num)."\n";

  $num = "77";
  echo "decimal value of ". $num. " is: ". octdec($num)."\n";

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

  $num = "107";
  echo "decimal value of ". $num. " is: ". octdec($num)."\n";

?>

#     
## Explanation 

In the code above, we use the `octdec` method to convert the octal strings of `70`, `77`, `100` and `107` into decimal representation.

What is the octdec() method in PHP?

Syntax

Parameters

Return value

Code

Explanation