&lt;?php$x = &quot;test&quot;;$y = &quot;this&quot;;$z = &quot;also&quot;; $x .= $y .= $z ;echo $x;echo $y;?&gt;
A. testthisthisalso
B. testthis
C. testthisalsothisalso
D. error at line 4
Answer:A
&lt;?php$x = &quot;test&quot;;$y = &quot;this&quot;;$z = &quot;also&quot;; $x .= $y .= $z ;echo $x;echo $y;?&gt;
A. testthisthisalso B. testthis C. testthisalsothisalso D. error at line 4
Explanation: The x .= y is a shorthand for x = x.y and this is evaluated from right to left.