&lt;?php        function foo&#40;$msg&#41;        &#123;            echo &quot;$msg&quot;;        &#125;        $var1 = &quot;foo&quot;;        $var1&#40;&quot;will this work&quot;&#41;;    ?&gt;
A. Error.
B. $msg
C. 0
D. will this work
Answer:A
&lt;?php        function foo&#40;$msg&#41;        &#123;            echo &quot;$msg&quot;;        &#125;        $var1 = &quot;foo&quot;;        $var1&#40;&quot;will this work&quot;&#41;;    ?&gt;
A. Error. B. $msg C. 0 D. will this work
Explanation:It is possible to call a function using a variable which stores the function name.