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                # 獲取和輸入變量 在控制器中獲得輸入的變量值。 例URL:http://localhost/Index/index/cid/1/id/2 使用I()方法獲取cid和id的值。 ~~~ class IndexController extends Controller{ public function index(){ $cid = I('cid'); //相當于$_GET['cid'] $id = I('id); //相當于$_GET['id'] echo 'cid的值是:'.$cid; echo '<br/>'; echo 'id的值是:'.$id; } } ~~~ <br/><br/> ## 默認值 如果需要在獲取URL參數值為空的時輸出一個默認值,則可使用以下I方法參數,以下方式都是可以的。 ~~~ $id = I('id','默認值'); $id = I('id','def'); $id = I('id',''); $id = I('id',0); $id = I('id',1); ~~~ <br/><br/> ## 指定獲取方式 如果需要指定獲取值是get方式或post方式,則可以使用以下格式。 ~~~ //當URL: http://localhost/index.php/Index/index/id/10 $id = I('get.id',0); //$id輸出:10 $id = I('post.id',0); //$id輸出:0(默認值) ~~~ ~~~ //當從表單提交 <input name=id value=10/> 時 $id = I('get.id',0); //$id輸出:0(默認值) $id = I('post.id',0); //$id輸出:10 ~~~
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