PHP 8.1 deprecated & date issue

[instantflorian]

modify_file.phtml / save_file.phtml:
Deprecated-Meldung wegen leerem htmlspecialchars beim WYSIWYG-Editor
Fatal Error, wenn ungültiges Release-Datum angegeben

Vorschlag:
Abfrage date_released mit input file=date und Lösch-Checkbox

<tr>
    	<td><label for="released"><?php echo $DGTEXT['THRELEASED']; ?></label>:</td>
    	<td>
    		<input type="date" name="released" id="released" value="<?php if($data->released > 1): echo date('Y-m-d', $data->released); endif; ?>" />
		<input type="checkbox" name="delete_datereleased" id="delete_datereleased" value="yes" /><label for="delete_datereleased"><?php echo $TEXT['DELETE']; ?></label>
    	</td>
 </tr>

Prüfung, ob description leer

<tr>
    	<td colspan="2">
    		<?php 
			if ($data->description != null) {
				show_wysiwyg_editor("description","description",htmlspecialchars($data->description), "100%", "400"); 
			} else {
				show_wysiwyg_editor("description","description","", "100%", "400"); 
			}
			?>
    	</td>
    </tr>

Anpassung der save_file.php

if ($released <> '') {
	$rdate = strtotime($released);	
	if ($rdate==false || isset($_POST['delete_datereleased'])  && $_POST['delete_datereleased']  == 'yes') {
		$qs = $database->query("UPDATE `".TABLE_PREFIX.$tablename."_files` SET `released` = '' WHERE `file_id` = '$file_id' AND `page_id` = '$page_id'");
	} else {
		$qs = $database->query("UPDATE `".TABLE_PREFIX.$tablename."_files` SET `released` = '$rdate' WHERE `file_id` = '$file_id' AND `page_id` = '$page_id'");
	}
}