php grades array 42 hello total arraysum print this returns..., PHP Arrays, PHP

Question:<?php
    $grades = array(42, "hello", 42);
    $total = array_sum($grades);
    print $total;
?> 

This returns the following:

A 48 
B 84 
C 44 
D 42 hello 42

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Question:<?php $grades = array(42, "hello", 42); $total = array_sum($grades); print $total; ?> This returns the following: