title: PSR-2 standard for long if-conditions
body: <p>I did not find any standard for this case:</p>
  
  <pre><code>if ($a == $b &amp;&amp; $b == $c &amp;&amp; $c == $d &amp;&amp; $g == $d) {
  
  }
  </code></pre>
  
  <p>or</p>
  
  <pre><code>if (($a == $b &amp;&amp; $b == $c) &amp;&amp; ($c == $d &amp;&amp; $g == $d)) {
  
  }
  </code></pre>
  
  <p>Imagine the var-names are longer and 80 letters are exceeded. How should I handle this?
  It could look like:</p>
  
  <pre><code>if (
         $a == $b
      &amp;&amp; $b == $c
      &amp;&amp; $c == $d
      &amp;&amp; $g == $d
  ) {
  
      }
  </code></pre>