PHP · all questions

Object Oriented Concept
practice.

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141

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Q1

Which one of the following is not a valid class name?

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Q2

Fill in the blank with the best option. An Object is a/an ________ of a class.

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Q3

Which version of PHP introduced the visibility keywords i.e public, private, and protected?

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Q4

Which characters is used to access property variables on an object-by-object basis?

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Q5

Code that uses a class, function, or method is often described as the.

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Q6

Which keyword precedes a method name?

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Q7

If you omit the visibility keyword in your method declaration, by default the method will be declared as.

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Q8

Which function is used to determine whether the variable’s value is either TRUE or FALSE?

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Q9

What will be the output of the following PHP code?

<?php
class ShopProductWriter
{
    public function write($shopProduct)
    {
       $str = "<span class="p-red">{$ shopProduct->title}: " . $shopProduct<span class="p-blue">-></span>getProducer<span class="p-blue">()</span> ." <span class="p-red">({$ shopProduct->price})n";
      print $str;
    }
}
$product1 = new ShopProduct( "My Antonia", "Willa", "Cather", 5.99 );
$writer = new ShopProductWriter();
 $w r i t er < s p an c l a ss = " p - b l u e " > - >< / s p an > w r i t e ($ product1 );
?>

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Q10

Which version of PHP introduced class type hints?

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Q11

Inheritance is the means by which one or more classes can be derived from a/an ___ class.

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Q12

What will be the output of the following PHP code?

<?php
class MyClass
{
}
 
$a = new MyClass;
var_dump(!($a instanceof stdClass));
?>

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Q13

What should be used to refer to a method in the context of a class rather than an object you use?

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Q14

Prior to which version of PHP did constructors took the name of the enclosing class.

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Q15

Which method or property can only be accessed from within the enclosing class? Even subclasses have no access.

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Q16

A mutator method is also called as.

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Q17

Which version of PHP introduced the static keyword?

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Q18

Which keyword is used to access a static method or property from within the same class(rather than from child)?

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Q19

In which of the following circumstance should you use a static reference to a non static method?

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Q20

Which one of the following variable cannot be used inside a static method?

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