ly recommended on platforms where
this information may be unreliable.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nx">is_really_writable</span><span class="p">(</span><span class="s1">&#39;file.txt&#39;</span><span class="p">))</span>
<span class="p">{</span>
        <span class="k">echo</span> <span class="s2">&quot;I could write to this if I wanted to&quot;</span><span class="p">;</span>
<span class="