For Loops Interview Questions and Answers

This set of PHP Multiple Choice Questions & Answers (MCQs) focuses on “For Loops – 2”.

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

```
<?php
```
```
for ($x = 1; $x < 10; $x++)
```
```
    for ($y = 1; $y < 5; $y++)
```
```
        print "Hello";
```
```
?>
```

a) Hello….36 times
b) Hello….45 times
c) Hello….50 times
d) Hello….40 times
View Answer

Answer: a
Explanation: 9*4 times is printed.

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

```
<?php
```
```
for ($count = 1; $count != 20;$count++)
```
```
{
```
```
    print $count;
```
```
    $count++;
```
```
}
```
```
?>
```

a) Infinite
b) 123…….20
c) 1357…19
d) 13579…21
View Answer

Answer: a
Explanation: Condition always fails as count takes only odd numbers.

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

```
<?php
```

for ($count = 1; $count < 20; $count++);

```
    print $count;
```
```
?>
```

a) 20
b) 19
c) 12345678910….19
d) 12345678910….1920
View Answer

Answer: a
Explanation: The for loop has no body, it just runs till condition is satisfied.

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

```
<?php
```
```
for ($count = 0; $count < 3;$count++);
```
```
{
```
```
    print "hi";continue;print "hello";
```
```
}
```
```
?>
```

a) hihihi
b) hihellohihellohihello
c) hellohellohello
d) hi
View Answer

Answer: a
Explanation: When continue is encountered it skips to the next iteration.

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

```
<?php
```
```
for ($count = 0; $count<3;$count++);
```
```
{
```
```
    print "hi";break;print "hello";
```
```
}
```
```
?>
```

a) hihihi
b) hihellohihellohihello
c) hellohellohello
d) hi
View Answer

Answer: d
Explanation: When break is encountered it leaves the loop.

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

```
<?php
```
```
for(++$i; ++$i; ++$i)
```
```
{
```
```
    print $i;
```
```
    if ($i == 4) 
```
```
        break;
```
```
}
```
```
?>
```

a) 24
b) 134
c) 1234
d) 1
View Answer

Answer: a
Explanation: The order of execution is initialization, check, increment/decrement, check, increment/decrement, check, increment/decrement….so on.

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

```
<?php
```
```
for ($i = 0;$i = -1;$i = 1)
```
```
{
```
```
    print $i;
```
```
    if ($i != 1) 
```
```
	break;
```
```
}
```
```
?>
```

a) 0
b) infinite loop
c) -1
d) 1
View Answer

Answer: c
Explanation: The order of execution is initialization, check, increment/decrement, check, increment/decrement, check, increment/decrement….so on.

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

```
<?php
```
```
for(;;)
```
```
{
```
```
   print "10";
```
```
}
```
```
?>
```

a) 10
b) infinite loop
c) no output
d) error
View Answer

Answer: b
Explanation: There is no check condition to stop the execution of the loop.

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

```
<?php
```
```
for ($i = 0; $i < 3; $i++)
```
```
{
```
```
    for($j = $i; $j > 0; $j--)
```
```
        print " ";
```
```
    for($k = $j; $k < 3; $k++)
```
```
        print "*";
```
```
	print "\n";  
```
```
}
```
```
?>
```

   
     *
    **
   ***

   ***
   **
   *

   *
   **
   ***

d) error
View Answer

Answer: a
Explanation: Follow the trace of i, j prints 3 – i no of spaces for each i, k prints i stars for each loop.

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

```
<?php
```
```
for ($i = 0; -5 ; $i++)
```
```
{
```
```
    print"i";
```
```
    if ($i == 3)
```
```
        break;
```
```
}
```
```
?>
```

a) 0 1 2 3 4
b) 0 1 2 3
c) 0 1 2 3 4 5
d) error
View Answer

Answer: b
Explanation: The break statement after breaks the loop after i=3, does not print anymore.

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