What Will Be The Output Of The Following Php Codep Pre Langphp #416

What will be the output of the following PHP code?</p> <pre><code class="language-php" line="1"> <?php $color1 = "red"; $color2 = "green"; echo "$color1" + "$color2"; ?> </code></pre>

This multiple choice question (MCQ) is related to the book/course gs gs107 PHP: Hypertext Preprocessor. It can also be found in gs gs107 PHP Variables - PHP Syntax - Quiz No.2.

 <?php $color1 = "red"; $color2 = "green"; echo "$color1" + "$color2"; ?>