&lt;?phpconst $b = 1;switch&#40;$b&#41;&#123;case 1:    print &quot;hi&quot;;    break;case 1:    print &quot;hello&quot;;    break;default:    print &quot;hi1&quot;;&#125;?&gt;
A. error
B. hi
C. hihello
D. hello
Answer:A
&lt;?phpconst $b = 1;switch&#40;$b&#41;&#123;case 1:    print &quot;hi&quot;;    break;case 1:    print &quot;hello&quot;;    break;default:    print &quot;hi1&quot;;&#125;?&gt;
A. error B. hi C. hihello D. hello
Explanation: Constants cannot be used in switch cases.