PHP Questions and Answers for Entrance exams on “Operators – 3”.
1. What will be the output of the following PHP code?
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echo 5 * 9 / 3 + 9;
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?>
a) 24
b) 3.7
c) 3.85
d) 0
Answer: a
Clarification: Operator precedence order must be followed.
2. What will be the output of the following PHP code?
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echo 5 * 9 / 3 + 9
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?>
a) 24
b) 3.7
c) 3.85
d) 0
Answer: a
Clarification: Operator precedence order must be followed.
3. What will be the output of the following PHP code?
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$i = 0;
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$j = 0;
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if ($i && ($j = $i + 10)) {
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echo "true";
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} -
echo $j;
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?>
a) 10
b) 0
c) true0
d) true10
Answer: b
Clarification: In if condition when the first case is 0 and is an && operation then the second command is not executed.
4. What will be the output of the following PHP code?
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$i = 10;
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$j = 0;
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if ($i || ($j = $i + 10)) {
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echo "true";
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} -
echo $j;
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?>
a) 20
b) true0
c) 0
d) true20
Answer: b
Clarification: In if condition when the first case is 1 and is an || operation then the second command is not executed.
5. What will be the output of the following PHP code?
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$i = 1;
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if ($i++ && ($i == 1))
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printf("Yesn$i");
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else -
printf("Non$i");
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?>
a) No 2
b) Yes 1
c) Yes 2
d) No 1
Answer: a
Clarification: The first condition returns true and increments but the second condition is false.
6. What will be the output of the following PHP code?
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$a = 1; $b = 3;
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$d = $a++ + ++$b;
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echo $d;
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?>
a) 5
b) 4
c) 3
d) error
Answer: a
Clarification: Post increment of a is done after expression evaluation.
7. What will be the output of the following PHP code?
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$a = 1; $b = 1; $d = 1;
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print ++$a + ++$a+$a++; print $a++ + ++$b; print ++$d + $d++ + $a++;
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?>
a) 869
b) 742
c) 368
d) error
Answer: a
Clarification: Follow the order of post and pre increments.
8. What will be the output of the following PHP code?
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$a = 10; $b = 10;
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if ($a = 5)
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$b--;
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print $a;print $b--;
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?>
a) 58
b) 59
c) 109
d) 108
Answer: b
Clarification: a is set to 5 in the if condition and b is post decremented in the print statement.
9. What will be the output of the following PHP code?
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$i = 0;
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$x = $i++; $y = ++$i;
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print $x; print $y;
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?>
a) 02
b) 12
c) 01
d) 21
Answer: a
Clarification: First case i is incremented after setting x to i.
10. What will be the output of the following PHP code?
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$a = 5; $b = -7; $c =0;
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$d = ++$a && ++$b || ++$c;
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print $d; print $a;
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?>
a) 16
b) 06
c) 15
d) 05
Answer: a
Clarification: 1&&0||1 is evaluated to 1 and the a is also preincremented to 6.
11. What will be the output of the following PHP code?
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$b = 1; $c = 4; $a = 5;
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$d = $b + $c == $a;
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print $d;
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?>
a) 5
b) 0
c) 10
d) 1
Answer: d
Clarification: First b and c are added and then tested if d=5, which is true thus return 1.
PHP for Entrance exams,