Question

我正在尝试调整我使用表单上传的图片的大小。我在这里使用脚本场景：http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/

我也使用以下代码上传图片：

upload.php的：

    <?php

    session_start();
    require_once "database.php";
    db_connect();
    require_once "auth.php";
    $current_user = current_user();

    $emailstring = $current_user['email'];

//Check to see if the type of file uploaded is a valid image type
function is_valid_type($file)
{
    //This is an array that holds all the valid image MIME types
    $valid_types = array("image/jpg", "image/jpeg", "image/bmp", "image/gif", "image/png");

    if (in_array($file['type'], $valid_types))
        return 1;
    return 0;   

}

function showContents($array) 
    {

        echo "<pre>";
        print_r($array);
        echo "</pre>";
    }

//Set some constants

//This variable is the path to the image folder where all the images are going to be stored

//Note that there is a trailing forward slash
$TARGET_PATH = "profile_images/";

//Get our POSTed variables
$upload_picture_fileinput = $_FILES['upload_picture_fileinput'];


//Sanitize input
$upload_picture_fileinput['name'] = mysql_real_escape_string($upload_picture_fileinput['name']);

//Build our target path full string.  This is where the file will be moved to
//i.e. profile_images/picture.jpg
$TARGET_PATH .= $upload_picture_fileinput['name'];

if(!is_valid_type($upload_picture_fileinput)) {

    $_SESSION['error'] = "You must upload a jpeg, gif, bmp, or png";
    header("Location: account.php");
    exit;


    }

//attempt to move the file from its temporary directory to its new home
if (move_uploaded_file($upload_picture_fileinput['tmp_name'], $TARGET_PATH)) {

    $sql = "UPDATE `users` SET `profile_image_filename`='" . $upload_picture_fileinput['name'] . "'
                       WHERE email='$emailstring'";


    $result = mysql_query($sql) or die ("Could not insert data into DB: " . mysql_error());

    header("Location: account.php");
    exit;
}
else 
{


    $_SESSION['error'] = "Could not upload file.  Check read/write permissions on the directory";
    header("Location: account.php") ;
    exit;

    }

我的表格是：

<div class="pictures add_pictures">
            <div class="add_picture">
                <div class="upload_picture">
                    <form action="upload.php" method="POST" enctype="multipart/form-data" name="upload_picture_form" class="upload_picture_form">
                        <span class="add_picture_label">+ Add a Profile Picture</span>
                        <input type="file" name="upload_picture_fileinput" class="upload_picture_file_input"/>
                        <input type="hidden" name="MAX_FILE_SIZE" value="100000"/>
                        <br><br><br><br><br><br><br>

                        <input type="submit" id="submit" value="Upload" />
                    </form>
                </div>
            </div>
        </div>

        <?php

            $sql = "select * FROM `users` WHERE `id`='$id'";
            $result = mysql_query($sql) or die ("Could not access DB: " . mysql_error());



                $row = mysql_fetch_assoc($result);


                echo "<p>";

                echo "<img src=\"profile_images/" . $row['profile_image_filename'] . "\" alt=\"\" /><br />";
                echo "</p>";



        ?>
                                    //not currently working
                <img src="/imageresize.php"/>

上面的回显可以很好地打印图片，但是当我尝试使用该文件名来调整图片大小时，它不会显示/工作。

<?php
    session_start();
    require_once "database.php";
    db_connect();
    require_once "auth.php";
    $current_user = current_user();

    $resized_image = '\"profile_images/" . $row['profile_image_filename'] . "\" alt=\"\" /';

    header('Content-Type: image/jpg');
    include('SimpleImage.php');
    $image = new SimpleImage();
    $image->load($resized_image);
    $image->resizeToWidth(300);
    $image->output();


?>

我正在连接数据库并且图像文件名正在保存在我的数据库中。我只是不知道为什么上面的文件路径会打印图片，但不能在resize脚本中工作。如果可以的话请帮忙。谢谢。

Answer 1

下面的代码创建了一个名为createThumbs的函数，它将获得三个参数。第一个和第二个相应地是包含原始图像的目录的路径以及放置缩略图的目录的路径。第三个参数是缩略图图像所需的宽度。

<?php
    function createThumbs( $pathToImages, $pathToThumbs, $thumbWidth ) 
    {
      // open the directory
      $dir = opendir( $pathToImages );

      // loop through it, looking for any/all JPG files:
      while (false !== ($fname = readdir( $dir ))) {
        // parse path for the extension
        $info = pathinfo($pathToImages . $fname);
        // continue only if this is a JPEG image
        if ( strtolower($info['extension']) == 'jpg' ) 
        {
          echo "Creating thumbnail for {$fname} <br />";

          // load image and get image size
          $img = imagecreatefromjpeg( "{$pathToImages}{$fname}" );
          $width = imagesx( $img );
          $height = imagesy( $img );

          // calculate thumbnail size
          $new_width = $thumbWidth;
          $new_height = floor( $height * ( $thumbWidth / $width ) );

          // create a new temporary image
          $tmp_img = imagecreatetruecolor( $new_width, $new_height );

          // copy and resize old image into new image 
          imagecopyresized( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );

          // save thumbnail into a file
          imagejpeg( $tmp_img, "{$pathToThumbs}{$fname}" );
        }
      }
      // close the directory
      closedir( $dir );
    }
    // call createThumb function and pass to it as parameters the path 
    // to the directory that contains images, the path to the directory
    // in which thumbnails will be placed and the thumbnail's width. 
    // We are assuming that the path will be a relative path working 
    // both in the filesystem, and through the web for links
    createThumbs("upload/","upload/thumbs/",100);
    ?>

Answer 2

在$ resized_image中看起来你已经添加了html alt标签，当然，这不应该是你输入$ image-＆gt; load（$ resized_image）;.

的参数的一部分。

尝试将此更改为

$image->load('profile_images/' . $row['profile_image_filename']);

而不是已经定位html渲染的字符串。

使用php脚本调整图像大小

2 个答案: