Only Show Current & Before Year

 <select name="year" id='year' class="form-control">  
                     <option value=""> Select </option>  
                     <?php  
                     $before = 0; // Specify number of "year" selections.  
                     $year = date('Y');  
                     for( $i=4; $i>=$before; $i--)  
                     {  
                        $t = $year - $i;  
                        echo("<option value=\"$t\">$t</option>");  
                     }  
                     ?>  
                   </select>