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  72 <a class="permalink" href="ion/:%20Tutorial/:4.%20Symbols,%20Tables%20and%20Catalogs#">#</a>Symbols, Tables and Catalogs</h1><h2 id="Catalog">Catalog<a class="permalink" href="ion/:%20Tutorial/:4.%20Symbols,%20Tables%20and%20Catalogs#Catalog">#</a>
  73 </h2><p>The Catalog holds a collection of <a href="ion/Symbol/Table">ion\Symbol\Table</a> instances queried from <a href="ion/Reader">ion\Reader</a> and <a href="ion/Writer">ion\Writer</a> instances.</p><p>See also <a href="https://amzn.github.io/ion-docs/docs/symbols.html#the-catalog">the ION spec's symbol guide chapter on catalog</a>.</p><pre><code><span style="color: inherit" class="html">
  74 <span style="color: inherit" class="default">&lt;?php<br>$catalog </span><span style="color: inherit" class="keyword">= new </span><span style="color: inherit" class="default">ion\Catalog</span><span style="color: inherit" class="keyword">;<br></span><span style="color: inherit" class="default">$symtab </span><span style="color: inherit" class="keyword">= </span><span style="color: inherit" class="default">ion\Symbol\PHP</span><span style="color: inherit" class="keyword">::</span><span style="color: inherit" class="default">asTable</span><span style="color: inherit" class="keyword">();<br></span><span style="color: inherit" class="default">$catalog</span><span style="color: inherit" class="keyword">-&gt;</span><span style="color: inherit" class="default">add</span><span style="color: inherit" class="keyword">(</span><span style="color: inherit" class="default">$symtab</span><span style="color: inherit" class="keyword">);<br></span><span style="color: inherit" class="default">?&gt;<br></span>
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