The **`abs()` function** returns the absolute value of a number. 

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

# 
#  Syntax

---
```php
number abs(num)
#  num is the number whose absolute value is required
```
---

##
## Parameter

The `abs()` function takes a number as a parameter. 

##
## Return value

The `abs()` function returns the absolute value of a number passed as a parameter.  

---
> If a `string` is passed to this function, it returns `0`.

<?php
#Positive number 
echo("abs(10): ");
echo (abs(10));
?>	
<?php
#Negative number 
echo("abs(-10): ");
echo (abs(-10));
?>

<?php
#zero
echo("abs(0): ");
echo (abs(0));
?>

<?php
#string
echo("abs('hello): ");
echo (abs('hello'));
?>


What is abs() in PHP?

The abs() function in PHP returns the absolute value of a number and returns 0 for strings.

What is abs() in PHP?

Syntax

Parameter

Return value

Code