PHP Constants Easy Questions and Answers

What will be the output of the following PHP code?

<?php
define("__LINE__", "She is beautiful");
echo "\n";
echo __LINE__;
?>

Correct Option: D

__LINE__ is a magical constant that gives the current line number and cannot be used as a variable/constant name.

What will be the output of the following PHP code ?

<?php
class Constants
{
    define('MIN_VA', '10.10');  
    define('MAX_VAL', '20.20');  
    public static function getMin()
    {
        return self::MIN_VAL;
    }
    public static function getMax()
    {
        return self::MAX_VAL;
    }
}
echo Constants::getMin();
echo Constants::getMax();
?>

Correct Option: A

In a class constants should be defined const MIN_VAL = 10.10; const MAX_VAL = 20.20; instead.

What will be the output of the following PHP code ?

<?php
define('ATTENTION_TEXT', 'Interview mania is good website.', true);
echo ATTENTION_TEXt;
$changing_var = 'text';
echo constant('ATTENTION_' . strtoupper($changing_var));
?>

Correct Option: C

echo constant(c) output c, and c here is the concatenation of ATTENTION_ and $changing_var with . operator.

What will be the output of the following PHP code ?

<?php
define("ATTENTION", "Interview mania is good website.", true);
echo $ATTENTION;
?>

Correct Option: B

Constants do not need a $ before them, they are referenced by their variable names itself.

What will be the output of the following PHP code ?

<?php
define("ATTENTION", "Interview mania is good website.", true);
echo ATTENTION;
echo "\n";
echo ATTENTION;
?>

Correct Option: C

Since the third parameter is true in define("ATTENTION", "Interview mania is good website.", true) is true ATTENTION becomes case insensitive.