&lt;?php$a = &quot;&quot;;if &#40;$a&#41;     print &quot;all&quot;;if else     print &quot;some&quot;;?&gt;
A. all
B. some
C. error
D. no output
Answer:A
&lt;?php$a = &quot;&quot;;if &#40;$a&#41;     print &quot;all&quot;;if else     print &quot;some&quot;;?&gt;
A. all B. some C. error D. no output
Explanation: Empty string is evaluated to 0.