PHP online quiz on “For Loops – 3”.
1. What will be the output of the following PHP code?
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for ($i = 0; 0; $i++)
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{ -
print"i";
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} -
?>
a) infinite loop
b) 0
c) no output
d) error
Answer: c
Clarification: The condition of the loop is always false 0.
2. What will be the output of the following PHP code?
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for ($i = 0; $i < 5; $i++)
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{ -
for ($j = $i; $j > 0; $i--)
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print $i;
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} -
?>
a) infinite loop
b) 0 1 2 3 4 5
c) 0 1 0 1 2 0 1 2 3 0 1 2 3 4 0 1 2 3 4 5 0 1 2 3 4 5
d) no output
Answer: a
Clarification: In the second loop j value is not being changed.
3. What will be the output of the following PHP code?
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for ($i = 0; $i < 5; $i++)
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{ -
for ($j = $i;$j > $i; $i--)
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print $i;
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} -
?>
a) infinite loop
b) 0 1 2 3 4 5
c) 0 1 0 1 2 0 1 2 3 0 1 2 3 4 0 1 2 3 4 5 0 1 2 3 4 5
d) no output
Answer: d
Clarification: The second loop does not execute as the check condition is always false.
4. What will be the output of the following PHP code?
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$user = array("Ashley", "Bale", "Shrek", "Blank");
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for ($x = 0; $x < count($user); $x++)
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{ -
if ($user[$x] == "Shrek")
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continue;
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printf ($user[$x]);
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} -
?>
a) AshleyBaleBlank
b) AshleyBale
c) AshleyBaleShrek
d) No output
Answer: a
Clarification: Only the Shrek is skipped due to the continue statement.
5. What will be the output of the following PHP code?
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$user = array("Ashley", "Bale", "Shrek", "Blank");
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for ($x=0; $x < count($user) - 1; $x++)
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{ -
if ($user[$x++] == "Shrek")
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continue;
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printf ($user[$x]);
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} -
?>
a) AshleyBaleBlank
b) Bale
c) AshleyShrek
d) BaleBlank
Answer: a
Clarification: Only Bale is printed as $x++ is done before printing and then checked.
6. What will be the output of the following PHP code?
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$user = array("Ashley", "Bale", "Shrek", "Blank");
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for ($x = 0; $x < count($user); $x)
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{ -
if ($user[$x++] == "Shrek")
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continue;
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printf ($user[$x]);
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} -
?>
a) AshleyBaleBlank
b) BaleShrek
c) AshleyBlank
d) Bale
Answer: b
Clarification: x is incremented only inside loop i the if condition.
7. What will be the output of the following PHP code?
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for ($i = 0; $i % ++$i; $i++)
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{ -
print"i";
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} -
?>
a) error
b) infinite loop
c) no output
d) 0
Answer: b
Clarification: Loop condition is true as i%(i+1) is a float non zero value in php.
8. What will be the output of the following PHP code?
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for ($i = 0; $i < 5; $i++)
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{ -
for(; $i < 5; $i++)
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print"i";
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} -
?>
a) iiiii
b) infinite loop
c) iiiiiiiiiiiiiiiiiiiiiiiii
d) no output
Answer: a
Clarification: The i value is changed in the inner loop and reaches five, thus does not execute the second outer loop.
9. What will be the output of the following PHP code?
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$a = array("hi", "hello", "bye");
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foreach ($a as $value)
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{ -
if (count($a) == 2)
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print $value;
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} -
?>
a) hihellobye
b) infinite loop
c) hihello
d) no output
Answer: d
Clarification: As count($a) returns 3 the condition is always false.
10. What will be the output of the following PHP code?
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$a = array("hi", "hello", "bye");
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for (;count($a) < 5;)
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{ -
if (count($a) == 3)
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print $a;
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} -
?>
a) ArrayArrayArrayArrayArrayArray….infinitely
b) (“hi”,”hello”,”bye”)(“hi”,”hello”,”bye”)(“hi”,”hello”,”bye”)(“hi”,”hello”,”bye”)…infinitely
c) hihellobyehihellobyehihellobyehihellobyehihellobyehihellobye…..infinitely
d) no output