Question

我有一个脚本执行一些简单的编辑工作正常，问题是甚至一旦图像上传成功，我刷新页面正在创建相同的图像，即使它没有从表单提交的文件输入中选择：

<form  method="post"  enctype="multipart/form-data" id="<?php echo $_SERVER['PHP_SELF']; ?>">
                     <fieldset id="product-images">
                    <input type="file" id="image" name="image" />
                    <input type="submit" name="picture" value="upload Picture"/>
</form>

这是php

 <?php if(isset($_POST['picture']) && !empty($_FILES)){(uploadImage($_FILES['image'])} ;?>   

function uploadImage($image)
{
    $id = intval($_GET['id']);
    $size = 75; // the thumbnail height

    $filedir = '../img/products/'; // the directory for the original image
    $thumbdir = '../img/products/thumbs/'; // the directory for the thumbnail image
    $prefix = 'small_'; // the prefix to be added to the original name

    $maxfile = '2000000';
    $mode = '0666';

    $userfile_name = $image['name'];
    $userfile_tmp = $image['tmp_name'];
    $userfile_size = $image['size'];
    $userfile_type = $image['type'];

    if (isset($image['name'])) 
    {
        $prod_img = $filedir.$userfile_name;
        $url = strstr($userfile_name, '.', true);
        $type = strstr($userfile_name, '.');


        $prod_img_thumb = $thumbdir.$prefix.$userfile_name;
        move_uploaded_file($userfile_tmp, $prod_img);
        chmod ($prod_img, octdec($mode));

        $sizes = getimagesize($prod_img);
        $width = $size[0];
        $height = $size[1];
        if($width > $height) $biggestSide = $width;
        else $biggestSide = $height;

        //The crop size will be half that of the largest side
        $cropPercent = 1;
        $cropWidth   = $biggestSide*$cropPercent;
        $cropHeight  = $biggestSide*$cropPercent;

        //getting the top left coordinate
        $c1 = array("x"=>($width-$cropWidth)/2, "y"=>($height-$cropHeight)/2);

        $aspect_ratio = $sizes[1]/$sizes[0]; 

        if ($sizes[1] <= $size)
        {
            $new_width = $sizes[0];
            $new_height = $sizes[1];
        }else{
            $new_height = $size;
            $new_width = abs($new_height/$aspect_ratio);
        }

        $destimg=ImageCreateTrueColor($new_width,$new_height)
            or die('Problem In Creating image');
        $srcimg=ImageCreateFromJPEG($prod_img)
            or die('Problem In opening Source Image');
        if(function_exists('imagecopyresampled'))
        {
            imagecopyresampled($destimg,$srcimg,0,0,$c1['x'],$c1['y'],$new_width,$new_height,ImageSX($srcimg),ImageSY($srcimg))
            or die('Problem In resizing');
        }else{
            Imagecopyresized($destimg,$srcimg,0,0,0,0,$new_width,$new_height,ImageSX($srcimg),ImageSY($srcimg))
            or die('Problem In resizing');
        }
        ImageJPEG($destimg,$prod_img_thumb,90)
            or die('Problem In saving');
        imagedestroy($destimg);
        imagedestroy($srcimg);

        insertURL($id, $url, $type);

    }


}

Answer 1

您正在刷新哪个页面？ “你上传的已完成”一个？这是有道理的 - 这是上传的结果页面。刷新那个会给你通常的“这个页面是POST的结果？重做POST？”键入警告，它将重新提交整个表单，包括文件。

为防止刷新重新上传，您必须在表单处理代码完成后将用户重定向到其他位置。

<?php

if ($_SERVER['REQUEST_METHOD'] == 'POST') {

    // handle the upload

    if (/*form processed OK*/) {
       header("Location: successpage.php");
       exit();
    } else {
       // report any error conditions
    }
}

// show the form

?>

Answer 2

在这里阅读POST-REDIRECT-GET：

http://en.wikipedia.org/wiki/Post/Redirect/Get

Answer 3

当您刷新页面时，表单会重新发送，一切都会重新发生。使用表单时的一般规则是在脚本处理完提交的表单后将用户重定向到另一个页面。然后，即使他们重新加载页面，他们也不会重新提交任何内容，这样就会避免这样的问题

php $ _files一直在上传

3 个答案: