The **`disk_total_space()`** function in #key# PHP: Hypertext Preprocessor #key# is used to return the total number of bytes that are in the specified disk or filesystem. 



# 
#  Syntax

---
```css
disk_total_space(directory)
```
---

# 
#  Parameters

- **`directory`**: It is used to specify the name of the disk whose size we want to check.

##
## Return value

It returns the total size in bytes of the specified `directory`. It returns `false` in case of failure. 

##
## Code

The basic PHP code to demonstrate the use of the `disk_total_space()` function is as follows:

# 
## Explanation
The code above returns the total number of bytes in the `D` drive.

What is the PHP disk_total_space() function?

Returns total bytes of specified disk in PHP; syntax: disk_total_space(directory).