检查是否有openssl的支持

src/install/index.php

@@ -66,6 +66,7 @@ else if($step==2)
     $sp_host = (empty($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_HOST'] : $_SERVER['REMOTE_ADDR']);
     $sp_name = $_SERVER['SERVER_NAME'];
     $sp_max_execution_time = ini_get('max_execution_time');
+    $sp_openssl = (extension_loaded("openssl") ? '<font color=green>[√]On</font>' : '<font color=red>[×]Off</font>');
     $sp_allow_reference = (ini_get('allow_call_time_pass_reference') ? '<font color=green>[√]On</font>' : '<font color=red>[×]Off</font>');
     $sp_allow_url_fopen = (ini_get('allow_url_fopen') ? '<font color=green>[√]On</font>' : '<font color=red>[×]Off</font>');
     $sp_safe_mode = (ini_get('safe_mode') ? '<font color=red>[×]On</font>' : '<font color=green>[√]Off</font>');

src/install/templates/step-2.html

@@ -64,7 +64,7 @@
 			</tr>
 			<tr>
 					<td><strong>PHP版本</strong></td>
-					<td><?php echo $phpv; ?></td>
+					<td><?php echo $phpv; ?><small>（建议使用PHP7.0以上版本）</small></td>
 			</tr>
 			<tr>
 					<td><strong>系统安装目录</strong></td>
@@ -81,6 +81,11 @@
 				<th width="80"><strong>要求</strong></th>
 				<th width="400"><strong>实际状态及建议</strong></th>
 			</tr>
+			<tr>
+				<td>OpenSSL</td>
+				<td align="center">On </td>
+				<td><?php echo $sp_openssl; ?> <small>(不符合将无法完成<a href="https://www.dedebiz.com" target="_blank">Dede商业支持</a>)</small></td>
+			</tr>
 			<tr>
 					<td>allow_url_fopen</td>
 					<td align="center">On </td>