PHP Coding Questions and Answers - Operators - 3

This set of PHP Multiple Choice Questions & Answers (MCQs) focuses on “Operators – 3”.

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

```
<?php
```
```
echo 5 * 9 / 3 + 9;
```
```
?>
```

a) 24
b) 3.7
c) 3.85
d) 0
View Answer

Answer: a
Explanation: Operator precedence order must be followed.

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

```
<?php
```
```
echo 5 * 9 / 3 + 9
```
```
?>
```

a) 24
b) 3.7
c) 3.85
d) 0
View Answer

Answer: a
Explanation: Operator precedence order must be followed.

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

```
<?php
```
```
$i = 0;
```
```
$j = 0;
```
```
if ($i && ($j = $i + 10)) {
```
```
    echo "true";
```
```
}
```
```
echo $j;
```
```
?>
```

a) 10
b) 0
c) true0
d) true10
View Answer

Answer: b
Explanation: In if condition when the first case is 0 and is an && operation then the second command is not executed.

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

```
<?php
```
```
$i = 10;
```
```
$j = 0;
```
```
if ($i || ($j = $i + 10)) {
```
```
    echo "true";
```
```
}
```
```
echo $j;
```
```
?>
```

a) 20
b) true0
c) 0
d) true20
View Answer

Answer: b
Explanation: In if condition when the first case is 1 and is an || operation then the second command is not executed.

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

```
<?php
```
```
$i = 1;
```
```
if ($i++ && ($i == 1))
```
```
    printf("Yes\n$i");
```
```
else
```
```
    printf("No\n$i");
```
```
?>
```

a) No 2
b) Yes 1
c) Yes 2
d) No 1
View Answer

Answer: a
Explanation: The first condition returns true and increments but the second condition is false.

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

```
<?php
```
```
$a = 1; $b = 3;
```
```
$d = $a++ + ++$b;
```
```
echo $d;
```
```
?>
```

a) 5
b) 4
c) 3
d) error
View Answer

Answer: a
Explanation: Post increment of a is done after expression evaluation.

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

```
<?php
```
```
$a = 1; $b = 1; $d = 1;
```

print ++$a + ++$a+$a++; print $a++ + ++$b; print ++$d + $d++ + $a++;

```
?>
```

a) 869
b) 742
c) 368
d) error
View Answer

Answer: a
Explanation: Follow the order of post and pre increments.

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

```
<?php
```
```
$a = 10; $b = 10;
```
```
if ($a = 5)
```
```
    $b--;
```
```
print $a;print $b--;
```
```
?>
```

a) 58
b) 59
c) 109
d) 108
View Answer

Answer: b
Explanation: a is set to 5 in the if condition and b is post decremented in the print statement.

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

```
<?php
```
```
$i = 0;
```
```
$x = $i++; $y = ++$i;
```
```
print $x; print $y; 
```
```
?>
```

a) 02
b) 12
c) 01
d) 21
View Answer

Answer: a
Explanation: First case i is incremented after setting x to i.

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

```
<?php
```
```
 $a = 5; $b = -7; $c =0; 
```
```
 $d = ++$a && ++$b || ++$c;
```
```
 print $d; print $a;
```
```
?>
```

a) 16
b) 06
c) 15
d) 05
View Answer

Answer: a
Explanation: 1&&0||1 is evaluated to 1 and the a is also preincremented to 6.

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

```
<?php
```
```
$b = 1; $c = 4; $a = 5; 
```
```
$d = $b + $c == $a;
```
```
print $d;
```
```
?>
```

a) 5
b) 0
c) 10
d) 1
View Answer

Answer: d
Explanation: First b and c are added and then tested if d=5, which is true thus return 1.

Sanfoundry Global Education & Learning Series – PHP Programming.

To practice all areas of PHP Programming, here is complete set of 1000+ Multiple Choice Questions and Answers on PHP.

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