title: bindParam is not completing the sql query
body: <p>I'm new to PDO statements and so far I've managed to work with it, use prepared statements and many things, until today.</p>
  
  <p>I have two querys, the first retrieve some data, store the results and then the second query uses that data to retrieve the final data. I'm working on a bad designed DB, that's why I have to do weird things.</p>
  
  <p>The first query gets the year of start and the year of end of a sport league. Then, the year is passed to the second query to get data between those years (WHERE).</p>
  
  <p>The problem is that bindParam seems to not work, it doesn't bind the parameter, shows a ?, and then the SQL throws the following exception:</p>
  
  <pre><code>Connection failed: SQLSTATE[42000]: Syntax error or access violation:
  1064 You have an error in your SQL syntax; check the manual that corresponds
  to your MySQL server version for the right syntax to use
  near ''0701' AND ?'0630' ORDER BY e.FECHA DESC' at line 5
  </code></pre>
  
  <p>The SQL:</p>
  
  <pre><code>$sqlQueryAuxiliar = "SELECT ano_inicio, ano_fin
                       FROM TEMPORADAS
                       ORDER BY ano_inicio DESC
                       LIMIT 1;";
  
  $sqlQuery = "SELECT  e.id, e.JORNADA, DATE_FORMAT(e.FECHA, '%Y-%m-%d'),
               e.HORA, c1.nombre_temporada, c2.nombre_temporada
               FROM    ENCUENTROS AS e
               JOIN    CLUBS AS c1 ON (e.COD_EQUIL = c1.siglas)
               JOIN    CLUBS AS c2 ON (e.COD_EQUIV = c2.siglas)
               WHERE   e.FECHA BETWEEN :anoInicio'0701' AND :anoFinal'0630'
               ORDER BY e.FECHA DESC;";
  </code></pre>
  
  <p>And this is the PHP code:</p>
  
  <pre><code>$this-&gt;_db-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $stmtAux = $this-&gt;_db-&gt;prepare($sqlQueryAuxiliar);
  $stmtAux-&gt;execute();
  $fetched = $stmtAux-&gt;fetchAll();
  $stmtAux = null;
  $stmt = $this-&gt;_db-&gt;prepare($sqlQuery);
  $stmt-&gt;bindParam(':anoInicio', $fetched[0][0], PDO::PARAM_STR, 12);
  $stmt-&gt;bindParam(':anoFinal', $fetched[0][1], PDO::PARAM_STR, 12);
  $stmt-&gt;execute();
  while ($row = $stmt-&gt;fetch()) {
      $partidos[] = $row;
  }
  $stmt = null;
  </code></pre>