Tough PHP Interview Questions & Answers on “Operators – 5”.
1. What will be the output of the following PHP code?
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$i = 0; $j = 1; $k = 2;
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print !(($i + $k) < ($j - $k));
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?>
a) 1
b) true
c) false
d) 0
Answer: a
Clarification: True is 1.
2. What will be the output of the following PHP code?
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$i = 0;$j = 1;$k = 2;
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print !(( + + $i + $j) > ($j - $k));
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?>
a) 1
b) no output
c) error
d) 0
Answer: b
Clarification: The equation outputs false .
3. What will be the output of the following PHP code?
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$i = 0;$j = 1;$k = 2;
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print (( + + $i + $j) >! ($j - $k));
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?>
a) 1
b) no output
c) error
d) 0
Answer: a
Clarification: Negation of a number is 0.
4. What will be the output of the following PHP code?
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$a = 0x6db7;
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print $a<<6;
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?>
a) 1797568
b) no output
c) error
d) 0x6dc0
Answer: a
Clarification: The output is in decimal.
5. What will be the output of the following PHP code?
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$a = 'a' ;
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print $a * 2;
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?>
a) 192
b) 2
c) error
d) 0
Answer: d
Clarification: Characters cannot be multiplied.
6. What will be the output of the following PHP code?
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$a = '4' ;
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print + + $a;
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?>
a) no output
b) error
c) 5
d) 0
Answer: c
Clarification: The character is type casted to integer before multiplying.
7. What will be the output of the following PHP code?
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$a = '12345';
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print "qwe{$a}rty";
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?>
a) qwe12345rty
b) qwe{$a}rty
c) error
d) no output
Answer: a
Clarification: {$}dereferences the variable within.
8. What will be the output of the following PHP code?
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$a = '12345';
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print "qwe".$a."rty";
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?>
a) qwe12345rty
b) qwe$arty
c) error
d) no output
Answer: a
Clarification: . dereferences the variable/string within.
9. What will be the output of the following PHP code?
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$a = '12345';
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echo 'qwe{$a}rty';
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?>
a) qwe12345rty
b) qwe{$a}rty
c) error
d) no output
Answer: b
Clarification: qwe{$a}rty, single quotes are not parsed.
10. What will be the output of the following PHP code?
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$a = '12345';
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echo "qwe$arty";
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?>
a) qwe12345rty
b) qwe$arty
c) qwe
d) error
Answer: c
Clarification: qwe, because $a became $arty, which is undefined.
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