Question

How to define constant values in class with PHP

Answer 1

class cl
{
    const CONSTANT = 'constant value';

    function showConstant() 
    {
        echo  self::CONSTANT . "<br />";
    }
}

echo cl::CONSTANT . "<br />";


/*
run: 

constant value

*/

 

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Answer 2

class cl
{
    const CONSTANT = 'constant value';

    function showConstant() 
    {
        echo  self::CONSTANT . "<br />";
    }
}

$classname = "cl";
echo $classname::CONSTANT . "<br />"; 


/*
run: 

constant value

*/

 

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Answer 3

class cl
{
    const CONSTANT = 'constant value';

    function showConstant() 
    {
        echo  self::CONSTANT . "<br />";
    }
}

$class = new cl();
$class->showConstant()


/*
run: 

constant value

*/

 

70+ SQL courses for beginners and professionals

Answer 4

class cl
{
    const CONSTANT = 'constant value';

    function showConstant() 
    {
        echo  self::CONSTANT . "<br />";
    }
}

$class = new cl();
echo $class::CONSTANT . "<br />";


/*
run: 

constant value

*/

 

70+ SQL courses for beginners and professionals