hat will be the output of the following PHP code?

hat will be the output of the following PHP code?

<?php
    $op2 = "blabla";
    function foo($op1)
    {
        echo $op1;
        echo $op2;
    }
    foo("hello");
    ?><?php
        function foo($msg)
        {
            echo "$msg";
        }
        $var1 = "foo";
        $var1("will this work");
    ?>