16. Who is the father of PHP?
    

1. 1. Drek Kolkevi

   
   
   

   2. List Barely

   
   
   

   3. Rasmus Lerdorf

   
   
   

   4. Willam Makepiece

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Rasmus Lerdorf

---

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

    <?php
    $math = "25 students";
    $Science = 35;
    $math = $math + $Science;
    echo "$math";
    ?>
    

1. 1. 25

   
   
   

   2. 35

   
   
   

   3. Error

   
   
   

   4. 60

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   The integer value at the beginning of the original $math string is used in the calculation. However if it begins with anything but a numerical value, the value will be 0.

---

---

18. Which of the below statements is equivalent to $sum+= $sum ?
    

1. 1. $sum= $sum+$sum

   
   
   

   2. $sum= $sum

   
   
   

   3. $sum= $sum+ $sum+ 1

   
   
   

   4. $sum= $sum+ 1

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   a += b is an addition assignment whose outcome is a = a + b. Same can be done with subtraction,multiplication,division etc.

---

19. Which statement will output $x on the screen?
    

1. 1. echo “$x;”;

   
   
   

   2. echo “/$x”;

   
   
   

   3. echo “$$x”;

   
   
   

   4. echo “\$x”;

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   A backslash is used so that the dollar sign is treated as a normal string character rather than prompt PHP to treat $x as a variable. The backslash used in this manner is known as escape character.

---

---

20. What will be the output of the following code?
    

    <?php
    function track() 
      {
        static $var = 0;
        $var++;
        echo $var;
      }
        track();
        track();
        track();
    ?>
    

1. 1. 000

   
   
   

   2. 010

   
   
   

   3. 110

   
   
   

   4. 123

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Because $count is static, it retains its previous value each time the function is executed.

---