PHP | abs( ) Function

The abs() fuction is a built-in function in PHP and 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:

abs(value)

Parameter: The abs() function accepts a single parameter value which is 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:

• When a positive number is passed as a parameter:

  <?php    echo (abs(6);    ?>

  Output:

  6

• When a negative number is passed as a parameter:

  <?php    echo (abs(-6);    ?>

  Output:

  6

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

  <?php    echo (abs(6.4);    ?>

  Output:

  6.4

• 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