Tough PHP Interview Questions

This set of Tough PHP Interview Questions & Answers focuses on “Operators – 5”.

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

```
<?php
```
```
$i = 0; $j = 1; $k = 2;
```
```
print !(($i + $k) < ($j - $k));
```
```
?>
```

a) 1
b) true
c) false
d) 0
View Answer

Answer: a
Explanation: True is 1.

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

```
<?php
```
```
$i = 0;$j = 1;$k = 2;
```
```
print !(( +  + $i + $j) > ($j - $k));
```
```
?>
```

a) 1
b) no output
c) error
d) 0
View Answer

Answer: b
Explanation: The equation outputs false .

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

```
<?php
```
```
$i = 0;$j = 1;$k = 2;
```
```
print (( +  + $i + $j) >! ($j - $k));
```
```
?>
```

a) 1
b) no output
c) error
d) 0
View Answer

Answer: a
Explanation: Negation of a number is 0.

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

```
<?php
```
```
$a = 0x6db7;
```
```
print $a<<6;
```
```
?>
```

a) 1797568
b) no output
c) error
d) 0x6dc0
View Answer

Answer: a
Explanation: The output is in decimal.

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

```
<?php
```
```
$a  =  'a' ;
```
```
print $a * 2;
```
```
?>
```

a) 192
b) 2
c) error
d) 0
View Answer

Answer: d
Explanation: Characters cannot be multiplied.

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

```
<?php
```
```
$a  =  '4' ;
```
```
print  +  + $a;
```
```
?>
```

a) no output
b) error
c) 5
d) 0
View Answer

Answer: c
Explanation: The character is type casted to integer before multiplying.

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

```
<?php
```
```
$a  =  '12345';
```
```
print "qwe{$a}rty";
```
```
?>
```

a) qwe12345rty
b) qwe{$a}rty
c) error
d) no output
View Answer

Answer: a
Explanation: {$}dereferences the variable within.

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

```
<?php
```
```
$a  =  '12345';
```
```
print "qwe".$a."rty";
```
```
?>
```

a) qwe12345rty
b) qwe$arty
c) error
d) no output
View Answer

Answer: a
Explanation: . dereferences the variable/string within.

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

```
<?php
```
```
$a  =  '12345';
```
```
echo 'qwe{$a}rty';
```
```
?>
```

a) qwe12345rty
b) qwe{$a}rty
c) error
d) no output
View Answer

Answer: b
Explanation: qwe{$a}rty, single quotes are not parsed.

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

```
<?php
```
```
$a  =  '12345';
```
```
echo "qwe$arty";
```
```
?>
```

a) qwe12345rty
b) qwe$arty
c) qwe
d) error
View Answer

Answer: c
Explanation: qwe, because $a became $arty, which is undefined.

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