&lt;?phpfunction string&#40;&#41;&#123;    echo strstr&#40;&quot;Hello world!&quot;, 111&#41;;&#125;string&#40;&#41;;?&gt;
A. o world!
B. Hello world!
C. 111
D. No Output
Answer:A
&lt;?phpfunction string&#40;&#41;&#123;    echo strstr&#40;&quot;Hello world!&quot;, 111&#41;;&#125;string&#40;&#41;;?&gt;
A. o world! B. Hello world! C. 111 D. No Output
Explanation: 111 is the ASCII value of o.