title: Short Code for PHP string with variable
body: <p>I have a query string that contains a variable like this</p>
  
  <pre><code>$field_name = 'features';
  $value = '5';
  $query = "SELECT * FROM Table WHERE $field_name\_tid = '$value'";
  </code></pre>
  
  <p>My goal is to print out the <code>$query</code> like this <code>SELECT * FROM Table WHERE features_tid = '5';</code>
  I put <code>\_</code> there hoping it would work as escape character, but it didn't work. Is there any way to achieve this without use methods like <code>". $field_name ."</code> and modifying original variable value?</p>