PHP abs() Function

The abs() function is an inbuilt function in PHP which is used to return the absolute (positive) value of a number. The abs() function in PHP is identical to what we call modulus in mathematics. The modulus or absolute value of a negative number is positive.

Syntax:

number abs( value )

Parameters: The abs() function accepts single parameter value which holds the number whose absolute value you want to find.

Return Value: It returns the absolute value of the number passed to it as argument.

Examples:

Input : abs(6)
Output : 6

Input : abs(-6)
Output : 6

Input : abs(6.4)
Output : 6.4

Input : abs(-6.4)
Output : 6.4

Below programs illustrate the abs() function in PHP:

Program 1: When a positive number is passed as a parameter:

<?php

echo (abs(6);

?>

Output:

6

Program 2: When a negative number is passed as a parameter:

<?php

echo (abs(-6);

?>

Output:

6

Program 3: When a positive number with decimal places is passed as a parameter:

<?php

echo (abs(6.4);

?>

Output:

6.4

Program 4: When a negative number with decimal places is passed as a parameter:

<?php

echo (abs(-6.4);

?>

Output:

6.4

Reference: http://php.net/manual/en/function.abs.php