Liste déroulante - Garder la dernière valeur choisie

<table>
	<tr>
		<td>
        Search by:
        </td>
	</tr>
	<tr>
    	<td align="center">
			<?php
				$selected = isset( $_GET['By'] ) ? $_GET['By'] : "" ;
				$selectedValue = 'selected="selected"';
				$arrayBy = array(
					'all' => 'All',
					'noproject' => '#Issue',
					'title' => 'Title',
					'clientname' => 'Client',
					'responsible' => 'Responsible',
					'datetimestart' => 'Started on',
					'duedate' => 'Due Date',
					'priority' => 'Priority');
											
					// Variable qui ajoutera l'attribut selected
					$selected = '';
 
					// Parcours du tableau
					echo '<select name="By">',"n";
					foreach($arrayBy as $valeurBy => $codeBy)
					{
						if($codeBy === 'all')
						{
							$selected = ' selected="selected"';
						}
												
						// Affichage de la ligne
						echo "\t",'<option value="', $valeurBy ,'"', $selected ,'>', $codeBy ,'</option>',"\n";
												
						// Remise à zéro de $selected
						$selected='';
						}
											
						echo '</select>',"\n";
						?>


		</td>
	</tr>
</table>