Understanding stream upload and form upload

Stream upload:

$post_input = ‘php://input‘;$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!‘ );}

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Standard form upload:

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!‘ );}

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PHP input stream PHP: // Input

When using XML-RPC, the server obtains client data mainly through the PHP input stream input instead of the $ _ post array. So here we will mainly discuss PHP input stream PHP: // Input

For PHP: // input introduction, the PHP official manual provides a clear overview of it:

"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 ".

The translation is like this:

"PHP: // input can read post data that has not been processed. Compared with $ http_raw_post_data, it puts less pressure on memory and does not require special PHP. ini settings. PHP: // input cannot be used for enctype = multipart/form-data"

How should we understand this overview? I divide it into three parts to gradually understand:

1. Read Post Data
2. Cannot be used for multipart/form-Data Type
3. PHP: // input vs $ http_raw_post_data

Read Post Data

Phper must be familiar with the built-in variable $ _ post. $ _ What are the associations and differences between post and PHP: // input? In addition, the most common method for the client to interact with the server is post and get. Since PHP: // input is used as the PHP input stream, can it read get data? These two questions are what we need to discuss in this section.

For details, see:

Http://www.nowamagic.net/academy/detail/12220520