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
$p = 2;
while ((--$p > ++$p) - 2)
{   
    print $p;
}
?>

(–$p > ++$p) evaluates to 2 but -2 makes it enters the loop and prints p which is 2.

What will be the output of the following PHP code ?

<?php
$k = -1;
while (++$k && --$k)
{   
    print $k;
}
?>

The first condition itself fails thus the loop exits.

What will be the output of the following PHP code ?

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

As it is || operator the second expression is not evaluated and p is always incremented, in the first case to 1.

What will be the output of the following PHP code ?

<?php
$n = 4;
while (++$n)
{   
    while ($n --> 0)
        print $n;
}
?>

The loop ends when n becomes 0.