Multiple choice php

Which of the following expressions multiply the value of the integer variable $a by 4?





    

      
    
            
  1. 
              
    $a *= pow (2, 2);
    
    
            
    2. 
            
  2. 
              
    $a >>= 2;
    
    
            
    3. 
            
  3. 
              
    $a <<= 2;
    
    
            
    4. 
            
  4. 
              
    $a = $a $a;
    
    
            
    5. 
      

    


    

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        A,C
        Correct answer
      

        

          Explanation
          

            
In PHP, '$a <<= 2' shifts the bits of $a two places to the left, which is equivalent to multiplying by 2 squared (4). The first option '$a *= pow(2, 2)' also results in $a * 4. Since this is a multiple-choice question with two correct options, both are valid logic.


          

        

    

  



          

      
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