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Operators And Expressions MCQ question and answer with solution | PHP Programming

Learn Operators And Expressions MCQ Questions and answers with easy and logical explanations. Operators And Expressions MCQ in PHP programming provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination Page-9 section-1

Each section contains 100 MCQs on Operators and Expressions in php .
81
What will be the output of the following PHP code ? 
<?php
$x = 0;
function fun()
{
    echo $GLOBALS['x'];
    $x++;
}
fun();
fun();
fun();
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
This question is similar to question 6.
82
What will be the output of the following PHP code ? 
<?php
$a = 10;
echo ++$a;
echo $a++;
echo $a;
echo ++$a;
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
++$a increments a and then prints it,$a++ prints and then increments.
83
What will be the output of the following PHP code ? 
<?php
$a = 12;
--$a;
echo $a++;
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
The + operator does union of arrays in that order, then the === operator compares key and value pairs.
84
What will be the output of the following PHP code ? 
<?php
$x = "test";
$y = "this";
$z = "also"; 
$x .= $y .= $z ;
echo $x;
echo $y;
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
The x .= y is a shorthand for x = x.y and this is evaluated from right to left.
85
What will be the output of the following PHP code ? 
<?php
$x = 1;
$y = 2;
if (++$x == $y++)
{
    echo "true ", $y, $x;
}
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
x is preincremented and y is post incremented thus both are 2 in the if condition, later y is incremented.
86
What will be the output of the following PHP code ? 
<?php
$y = 2;
$w = 4;
$y *= $w /= $y;
echo $y, $w;
?>
Discuss
Answer & Solution
Answer: Option D
Solution:
Expression is evaluated from right to left.
87
What will be the output of the following PHP code ? 
<?php
$y = 2;
if ($y-- == ++$y)
{
    echo $y;
}
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
First $y = 2 is compared to and then decremented, then incremented and compared to $y = 2.
88
What will be the output of the following PHP code ? 
<?php
$y = 2;
if (**$y == 4)
{
    echo $y;
}
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
The ** is not a valid operator,only ++ and — exist.
89
What will be the output of the following PHP code ? 
<?php
$y = 2;
if (--$y == 2 || $y xor --$y)
{
    echo $y;
}
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
–$y == 2 is false but y is decremented, the xor gives true if only one of the operands are true, thus 1 xor 0 is true.
90
What will be the output of the following PHP code ? 
<?php
$y = 2;
if (--$y <> ($y != $y++))
{
    echo $y;
}
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
–$y == 2 is false but y is decremented, the xor gives true if only one of the operands are true, thus 1 xor 0 is true.