250+ TOP PHP Coding MCQs on Constants and Answers

PHP Multiple Choice Questions on “Constants”.

1. What will be the output of the following PHP code?

define("GREETING", "PHP is a scripting language", true);

```
echo GREETING;
```
```
echo "
"
```
```
echo GREETING;
```
```
?>
```

a) PHP is a scripting language
b)

GREETING
GREEtING

c) GREETING
d)

PHP is a scripting language
PHP is a scripting language

Answer: d
Clarification: Since the third parameter is true in define(“GREETING”, “PHP is a scripting language”, true) is true GREETING becomes case insensitive.

2. What will be the output of the following PHP code?

define("GREETING", "PHP is a scripting language");

```
echo $GREETING;
```
```
?>
```

a) $GREETING
b) no output
c) PHP is a scripting language
d) GREETING
Answer: b
Clarification: Constants do not need a $ before them, they are referenced by their variable names itself.

3. What will be the output of the following PHP code?

define('GREETING_TEST', 'PHP is a scripting language', true);

```
echo GREETING_TESt;
```
```
$changing_variable = 'test';
```

echo constant('GREETING_' . strtoupper($changing_variable));

```
?>
```

PHP is a scripting language
PHP is a scripting language

b) GREETING_TESt
c) PHP is a scripting language
d)

PHP is a scripting language
GREETING_TEST

Answer: a
Clarification: echo constant(x) output x, and x here is the concatenation of GREETING_ and $changing variable with. operator.

4. What will be the output of the following PHP code?

```
class Constants
```
```
{
```
```
    define('MIN_VALUE', '0.0');  
```
```
    define('MAX_VALUE', '1.0');  
```

    public static function getMinValue()

```
    {
```
```
        return self::MIN_VALUE;
```
```
    }
```

    public static function getMaxValue()

```
    {
```
```
        return self::MAX_VALUE;
```
```
    }
```
```
}
```
```
echo Constants::getMinValue();
```
```
echo Constants::getMaxValue();
```
```
?>
```

a) 0.01.0
b) 01
c) No output
d) ERROR

250+ TOP MCQs on PHP Basics of Object-Oriented PHP- 1 and Answers

Answer: d
Clarification: In a class constants should be defined const MIN_VALUE = 0.0;const MAX_VALUE = 1.0; instead.

5. What will be the output of the following PHP code?

define("__LINE__", "PHP is a scripting language");

```
echo __LINE__;
```
```
?>
```

a) PHP is a scripting language
b) __LINE__
c) 2
d) ERROR
Answer: c
Clarification: __LINE__ is a magical constant that gives the current line number and cannot be used a variable/constant name.

6. What will be the output of the following PHP code?

```
define('IF', 42); 
```
```
echo "IF: ", IF;
```
```
?>
```

a) IF:42
b) No output
c) IF:
d) ERROR
Answer: d
Clarification: Keyword like IF cannot be used as constant names.

7. What will be the output of the following PHP code?

define("NEW_GOOD_NAME_CONSTANT", "I have a value");

define("OLD_BAD_NAME_CONSTANT", NEW_GOOD_NAME_CONSTANT);

```
 
```
```
echo NEW_GOOD_NAME_CONSTANT;
```
```
echo OLD_BAD_NAME_CONSTANT; 
```
```
?>
```

a) I have a value
b) I have a valueI have a value
c) ERROR
d) I have a valueNEW_GOO_NAME_CONSTANTS
Answer: b
Clarification: Constants can be set as values for other constants.

8. What will be the output of the following PHP code?

```
define('GOOD_OCTAL', 0700);
```
```
define('BAD_OCTAL', 0600);
```
```
print GOOD_OCTAL;
```
```
print '
';
```
```
print BAD_OCTAL; 
```
```
?>
```

448
384

0700
0800

c) ERROR
d) No output
Answer: a
Clarification: Anything starting from 0 is evaluated as an octal.

9. What will be the output of the following PHP code?

```
define("VAR_NAME","test"); 
```
```
${VAR_NAME} = "value"; 
```
```
echo VAR_NAME;
```
```
echo ${VAR_NAME}; 
```
```
?>
```

a) test
b) testtest
c) testvalue
d) error, constant value cannot be changed
Answer: c
Clarification: ${VAR_NAME} creates a new variable which is not same as VAR_NAME.

250+ TOP MCQs on PHP Working with Dates and Answers

10. What will be the output of the following PHP code?

```
class myObject { }
```
```
define('myObject::CONSTANT', 'test');
```
```
echo myObject::CONSTANT; 
```
```
?>
```

a) test
b) error
c) myObject::CONSTANT
d) no output
Answer: b
Clarification: Class constants cannot be defined outside class.

here is complete set of 250+ Multiple Choice Questions and Answers on PHP.

250+ TOP PHP Coding MCQs on Constants and Answers

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