 class="k">if</span> <span class="p">(</span><span class="nv">$foo</span> <span class="k">OR</span> <span class="nv">$bar</span><span class="p">)</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$foo</span> <span class="o">&amp;&amp;</span> <span class="nv">$bar</span><span class="p">)</span> <span class="c1">// recommended</span>
<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$foo</span><span class="p">)</span>
<span class="k">if</span>