The **`deg2rad()` function** in PHP converts a value in *degrees* to an equal value in *radians*.

Figure 1 below shows the mathematical representation of the `deg2rad()` function.

# 
#  Syntax

---
```php
float deg2rad(number)
```
---

# 
#  Parameter

The `deg2rad()` function takes a #key# number: degree value #key# as a parameter. 

##
## Return value

The `deg2rad()` function converts the degree value sent as a parameter to a value in radians.

##
## Code

<?php
#180
echo("deg2rad(180): ");
echo (deg2rad(180));
echo(" Radians");
?>	

<?php
#0
echo("deg2rad(0): ");
echo (deg2rad(0));
echo(" Radians");
?>	

<?php
#-180
echo("deg2rad(-180): ");
echo (deg2rad(-180));
echo(" Radians");
?>	



What is deg2rad() in PHP?

Converts degrees to radians using deg2rad() in PHP, returning a float value.