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理解流方式上传和form表单上传
流方式上传:
$post_input = ‘php://input‘;$save_path = dirname( __FILE__ );$postdata = file_get_contents( $post_input );if ( isset( $postdata ) && strlen( $postdata ) > 0 ) { $filename = $save_path . ‘/‘ . uniqid() . ‘.jpg‘; $handle = fopen( $filename, ‘w+‘ ); fwrite( $handle, $postdata ); fclose( $handle ); if ( is_file( $filename ) ) { echo ‘Image data save successed,file:‘ . $filename; exit (); }else { die ( ‘Image upload error!‘ ); }}else { die ( ‘Image data not detected!‘ );}
标准表单上传:
if (!$_FILES[‘Filedata‘]) { die ( ‘Image data not detected!‘ );}if ($_FILES[‘Filedata‘][‘error‘] > 0) { switch ($_FILES [‘Filedata‘] [‘error‘]) { case 1 : $error_log = ‘The file is bigger than this PHP installation allows‘; break; case 2 : $error_log = ‘The file is bigger than this form allows‘; break; case 3 : $error_log = ‘Only part of the file was uploaded‘; break; case 4 : $error_log = ‘No file was uploaded‘; break; default : break; } die ( ‘upload error:‘ . $error_log );} else { $img_data = $_FILES[‘Filedata‘][‘tmp_name‘]; $size = getimagesize($img_data); $file_type = $size[‘mime‘]; if (!in_array($file_type, array(‘image/jpg‘, ‘image/jpeg‘, ‘image/pjpeg‘, ‘image/png‘, ‘image/gif‘))) { $error_log = ‘only allow jpg,png,gif‘; die ( ‘upload error:‘ . $error_log ); } switch($file_type) { case ‘image/jpg‘ : case ‘image/jpeg‘ : case ‘image/pjpeg‘ : $extension = ‘jpg‘; break; case ‘image/png‘ : $extension = ‘png‘; break; case ‘image/gif‘ : $extension = ‘gif‘; break; } }if (!is_file($img_data)) { die ( ‘Image upload error!‘ );}
PHP输入流php://input
在使用xml-rpc的时候,server端获取client数据,主要是通过php输入流input,而不是$_POST数组。所以,这里主要探讨php输入流php://input
对于php://input介绍,PHP官方手册文档有一段话对它进行了很明确地概述:
“php://input allows you to read raw POST data. It is a less memory intensive alternative to $HTTP_RAW_POST_DATA and does not need any special php.ini directives. php://input is not available with enctype=”multipart/form-data”.
翻译过来,是这样:
“php://input可以读取没有处理过的POST数据。相较于$HTTP_RAW_POST_DATA而言,它给内存带来的压力较小,并且不需要特殊的php.ini设置。php://input不能用于enctype=multipart/form-data”
我们应该怎么去理解这段概述呢?我把它划分为三部分,逐步去理解:
- 读取POST数据
- 不能用于multipart/form-data类型
- php://input VS $HTTP_RAW_POST_DATA
读取POST数据
PHPer们一定很熟悉$_POST这个内置变量。$_POST与php://input存在哪些关联与区别呢?另外,客户端向服务端交互数据,最常用的方法除了POST之外,还有GET。既然php://input作为PHP输入流,它能读取GET数据吗?这二个问题正是我们这节需要探讨的主要内容。
详见:
http://www.nowamagic.net/academy/detail/12220520