title: PHP get string by string
body: <p>Let's say I have the following code</p>
  
  <pre><code>json_decode( $images_json );
  json_decode( $cites_json );
  </code></pre>
  
  <p>But instead I want to use the input by a dynamic string, like this...</p>
  
  <pre><code>json_decode( {{$name}}_json );
  </code></pre>
  
  <p>...where <code>$name</code> is a string containing "<code>images</code>" or "<code>cites</code>".</p>
  
  <p>Is it possible? How?</p>