What will be the output of the following PHP code ?<?php$str1

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What will be the output of the following PHP code ?

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

1. Hello Interview Mania
2. Interview Mania
3. Hello Interview Mania Interview Mania
4. Interview Mania Interview Mania
5. None of these

Correct Option: C

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