Question

How to declare and use constants in class with PHP

Answer 1

class ConstClass
{
    const PI = M_PI;
    const PI_2 = M_PI_2;
    const COST = 9.95;
}

$val = ConstClass::PI * ConstClass::PI_2 * ConstClass::COST;

echo $val;

 
/*
run: 
  
49.10128189542
  
*/    

 

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Answer 2

class ConstClass 
{
    const COST = 9.95;

    public function getCost($units) 
    {
         return self::COST * $units;
    }
}

$object = new ConstClass;

echo $object->getCost(10);

 
/*
run: 
  
99.5
  
*/                    

 

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