PHP Operators Easy Questions and Answers

What will be the output of the following PHP code ?

<?php
$num = 8;
while (--$num > 0 || ++$num)
{   
    print $num;
}
?>

As it is || operator the second expression is not evaluated till num becomes 1 then it goes into a loop.

What will be the output of the following PHP code ?

<?php
$n = 15;
while (--$n > 0 && ++$n)
{   
    print $n;
}
?>

As it is && operator it is being incremented and decremented continuously.

What will be the output of the following PHP code ?

<?php
$k = 10;
while (--$k > 0)
{   
    $k++;
    print $k;
    print "Interview Mania";
}
?>

k is decremented in the first while execution and then continuously incremented back.

What will be the output of the following PHP code ?

<?php
$s = 4;
$t = 8;
$s *= $t /= $s;
echo $s, $t;
?>

Expression is evaluated from right to left.

What will be the output of the following PHP code ?

<?php
$p = 5;
$q = 6;
if (++$p == $q++)
{
    echo "true ", $q, $p;
}
?>

p is preincremented and q is post incremented thus both are 6 in the if condition, later q is increment.