PHP While Loops MCQ - Sanfoundry

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

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

```
<?php
```
```
while()
```
```
{
```
```
    print "hi";
```
```
}
```
```
?>
```

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

Answer: d
Explanation: The while loop cannot be defined without a condition.

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

```
<?php
```
```
do
```
```
{
```
```
    print "hi";
```
```
}
```
```
while(0);
```
```
print "hello";
```
```
?>
```

a) infinite loop
b) hihello
c) hello
d) error
View Answer

Answer: b
Explanation: The do while loop executes at least once as the condition is in the while loop.

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

```
<?php
```
```
$i = 0
```
```
do
```
```
{
```
```
    print "hi";
```
```
    $i++;
```
```
}
```
```
while ($i != 3);
```
```
?>
```

   hi
   hi

b) hi
c)

   hi
   hi
   hi
   hi

d) no output
View Answer

Answer: c
Explanation: The check happens after the increment,thus it prints until i = 4.

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

```
<?php
```
```
$i = 0
```
```
while ($i != 3)
```
```
{
```
```
    print "hi";
```
```
	$i++;
```
```
}
```
```
?>
```

   hi
   hi

   hi
   hi
   hi

   hi
   hi
   hi
   hi

d) no output
View Answer

Answer: b
Explanation: The check happens before the increment, thus it prints until i = 3.

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

```
<?php
```
```
$i = 0
```
```
while ($i < 3)
```
```
{
```
```
    print "hi";
```
```
    $i--;
```
```
}
```
```
print "hello"
```
```
?>
```

   hi
   hi
   hello

   hi
   hi
   hi
   hello

   hi
   hi
   hi
   hi
   hello

d) infinite loop
View Answer

Answer: d
Explanation: There is no increment of i making it infinite.

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

```
<?php
```
```
$i = 0
```
```
while ($i < 3)
```
```
{
```
```
    $i++;
```
```
}
```
```
print $i;
```
```
?>
```

a) 2
b) 3
c) 0
d) 1
View Answer

Answer: b
Explanation: The increment happens and then the check happens.

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

```
<?php
```
```
$i = 0
```
```
do
```
```
{
```
```
    $i++;
```
```
}
```
```
while ($i < 3);
```
```
print $i;
```
```
?>
```

a) 2
b) 3
c) 0
d) 1
View Answer

Answer: b
Explanation: The increment happens and then the check happens.

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

```
<?php
```
```
$i = 0
```
```
while ($i++)
```
```
{
```
```
    print $i;
```
```
}
```
```
print $i;
```
```
?>
```

a) 0
b) infinite loop
c) 01
d) 1
View Answer

Answer: d
Explanation: As it is a post increment, it checks and then does not enter the loop, thus prints only 1.

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

```
<?php
```
```
$i = "";
```
```
while($i)
```
```
{   
```
```
    print "hi";
```
```
}
```
```
print "hello";
```
```
?>
```

a) hello
b) infinite loop
c) hihello
d) error
View Answer

Answer: a
Explanation: $i is null string which evaluates to false in the while loop and hence the statements inside the while loop won’t be executed.

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

```
<?php
```
```
$i = "";
```
```
while ($i)
```
```
{   
```
```
    print "hi";
```
```
} 
```
```
while($i < 8)
```
```
    $i++;
```
```
print "hello";
```
```
?>
```

a) hi is printed 8 times, hello 7 times and then hi 2 times
b) hi is printed 10 times, hello 7 times
c) hi is printed once, hello 7 times
d) hello
View Answer

Answer: d
Explanation: $i is null string which evaluates to false in the 1st while loop and hence the statements inside the 1st while loop won’t be executed. In the 2nd while loop, it increments 8 times, and then it prints “hello” once.

More MCQs on PHP While Loops:

PHP While Loops MCQ (Set 2)

Sanfoundry Global Education & Learning Series – PHP Programming.

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