PHP Data Types Aptitude Questions and Answers

1. In PHP, variables can store different type of data that is allowed according to PHP data-types.
2. In PHP, there is no need to use special keywords to specify the data type of variable.
3. In PHP, we use the 'int' keyword to declare an integer type variable.
4. We use predefined classes to specify data-types in PHP.

Options:

1. Only A
2. Only B
3. A and B
4. C and D

1. String
2. Array
3. Object
4. Resource

Options:

1. A and B
2. C and D
3. A, B, and C
4. A, B, C, and D

1. -32768 to 32767
2. -2,147,483,648 to 2,147,483,647
3. -128 to 127
4. None of the above

1. get_type()
2. var_type()
3. var_dump()
4. getType()

<?php  
	$num = 256;
	var_dump(num);
?>

1. int(256)
2. integer(256)
3. string(3) "num"
4. None of the above

<?php  
	$num = 256;
	var_dump($num);
?>

1. int(256)
2. integer(256)
3. string(3) "num"
4. None of the above

<?php  
	$num = 256;
	$num1 = var_dump($num);
	echo "num1 is ".$num1;
?>

1. int(256) num1 is int(256)
2. int(256) num1 is
3. Syntax error
4. None of the above

<?php  
	$num = "Hello";
	var_dump($num);
?>

1. string(hello)
2. string("hello")
3. string(5) "hello"
4. None of the above

<?php  
	$num = 256;
	var_dump($num);

	$num = "Hello";
	var_dump($num);
?>

1. int(256)
2. int(256) string(5) "Hello"
3. int(256) string(3)
4. syntax error

<?php  
	$num = true;
	var_dump($num);
?>

1. bool(true)
2. boolean(true)
3. bool(4) "true"
4. boolean(4) "true"

<?php  
	$usrArray = array("ABC","PQR","XYZ");
	var_dump($usrArray);
?>  

1. array(3) string
2. array(3) { [0]=> string(3) "ABC" [1]=> string(3) "PQR" [2]=> string(3) "XYZ" }
3. Syntax error
4. None of the above

<?php  
	$usrArray = array("ABC",786,"XYZ");
	var_dump($usrArray);
?>  

1. array(3) { [0]=> string(3) "ABC" [1]=> string(3) 786 [2]=> string(3) "XYZ" }
2. array(3) { [0]=> string(3) "ABC" [1]=> int(786) [2]=> string(3) "XYZ" }
3. Syntax error
4. None of the above

1. Yes
2. No

<?php
	$x = null;
	var_dump($x);
?>

1. NULL
2. NULL(4)
3. NULL(null)
4. None of the above

1. Yes
2. No

1. The resource type is used to contain the reference to the function.
2. The resource type is used to store the reference of external resources.
3. The resource type is used for the database call.
4. None of the above

Options:

1. A and B
2. B and C
3. A, B, and C
4. D

<?php

class Sample
{
    function Sample()
    {
        $Var1 = "India";
    }
}

// create an object of Sample class
$obj = new Sample();

echo $obj->$Var1;
?>

1. India
2. Error

<?php

class Sample
{
    function Sample()
    {
        $this->$Var1 = "India";
    }
}

// create an object of Sample class
$obj = new Sample();

echo $obj->$Var1;
?>

1. India
2. Error

<?php

class Sample
{
    function Sample()
    {
        $this->$Var2 = "Australia";
        $this->$Var1 = "India";
    }
}

// create an object of Sample class
$obj = new Sample();

var_dump($obj);
?>

1. object(Sample)#1 (1) { [""]=> string(5) "India" }
2. object(Sample)#1 (2) { [""]=> string(5) "Australia" }
3. Error
4. None of the above