title: Write two or more instructions in one line with PHP
body: <p>I have a very simple question for you guys.
  After deep researches, I've found nothing useful to get a good answer.</p>
  
  <p>I just really like to know the way to write multiple instructions/commands in the same line, with PHP.
  Just to be clear, this:</p>
  
  <pre><code>&lt;?php
    if (true) {
      echo "First,";
      echo " second";
      echo " and third.";
    }
  ?&gt;
  </code></pre>
  
  <p>shoud become this:</p>
  
  <pre><code>&lt;?php
    if (true)
      echo "First," &amp; echo " second" &amp; echo " and third";
  ?&gt;
  </code></pre>
  
  <p>So, the script above can execute three operations in one line of code.
  I tried to use the "&amp;" sign to append more instructions in the same line and it seems it works...
  Is this the correct way to do what I want to do? May this cause any problems?</p>
  
  <p>Thanks!</p>
  
  <p>PS: the "echo" instruction is just as example (I know that you can merge strings just using the dot (.) sign</p>