PHP Operators Easy Questions and Answers

What will be the output of the following PHP code ?

<?php
$t = 5;
if ($t-- == ++$t)
{
    echo $t;
}
?>

First $t = 5 is compared to and then decremented, then incremented and compared to $t = 5.

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.

What will be the output of the following PHP code ?

<?php
$str1 = "Hello ";
$str2 = "Interview ";
$str3 = "Mania "; 
$str1 .= $str2 .= $str3 ;
echo $str1;
echo $str2;
?>

The str1 .= str2 is a shorthand for str1 = str1.str2 and this is evaluated from right to left.

What will be the output of the following PHP code ?

<?php
$k = 15;
--$k;
echo $k++;
?>

The + operator does union of arrays in that order, then the === operator compares key and value pairs.