php - 从 MySQL 查看图像的脚本

Question

这实际上更像是一个答案而不是一个问题，但是当然，欢迎评论或其他解决方案，只要它们不涉及将图像保存到 MySQL 的对错。可以说它是在几十年前创建该网站时出于某种原因而完成的！

在重建我的一个 Web 开发系统后，这个脚本在整个站点中用于从 MySQL 获取图像，并在需要时添加文本或图像水印，然后将其呈现到屏幕上，但它不起作用。该脚本已经运行了十五年以上，但不适用于我的本地副本。断断续续地花了将近一个星期后，我突然意识到这是因为脚本文件本身没有正确编码！将其编码为 UTF-8 解决了这个问题。

发生的情况是，如果正确启用了标头，它会给出一个错误“图像无法显示，因为它包含错误”，并且标头已被标记出来，它只会显示 blob 内容。一旦文件被正确编码，它工作！

这是我的脚本，以防它帮助其他人，但请注意它确实使用了一些自定义数据库连接功能，因此需要重写数据库调用以在现实世界中使用。

<?php 

// Create variables from parameters
$ImageID = (isset($_GET['ID']) && is_numeric($_GET['ID'])) ? $_GET['ID'] : "";
$ImageType = (isset($_GET['Type']) && is_numeric($_GET['Type'])) ? $_GET['Type'] : "";
$Rand = (isset($_GET['Rand']) && is_numeric($_GET['Rand'])) ? $_GET['Rand'] : "";

// Be sure suffcient information was recieved to try to find image
if (!$ImageID && !$Rand == 1) die ("No image");

// Build dynamic path to common and secure functions
$dirSeparator = DIRECTORY_SEPARATOR;
$serverRoot = str_replace("/",$dirSeparator,$_SERVER['DOCUMENT_ROOT']);
$SiteFolder = @end(explode($dirSeparator,$serverRoot));
$CommonPath = str_replace($SiteFolder,"",$serverRoot) . "common" . $dirSeparator; //  With symbolic link
$SecurePath = str_replace($SiteFolder,"",$serverRoot) . "secure" . $dirSeparator; // Without symbolic link

// Get MySQL connection informaton and database functons
require("{$SecurePath}config.php");
require("{$CommonPath}db_mysql.php");

// Determine which table and image type to open, then create variables for the result
switch ($ImageType) :
    case 1:
        $sqlSelect = "SELECT Image, ImageFormat, Description, WatermarkLevel FROM table1 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect,"Select","db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $ImageName = $row['Description'];
            $WatermarkLevel = $row['WatermarkLevel'];
            $EnableText = 1;
        endif;
    break;
    case 2:
        $sqlSelect = "SELECT Thumbnail, ImageFormat, Description FROM table1 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Thumbnail'];
            $mime_type = $row['ImageFormat'];
            $ImageName = $row['Description'] . "_Thumbnail";
            $WatermarkLevel = 0;
            $EnableText = 0;
        endif;
    break;
    case 3:
        $sqlSelect = "SELECT Image, ImageFormat, Name, WatermarkLevel FROM table2 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['Name']);
            $ImageName = $NameParts[0];
            $WatermarkLevel = $row['WatermarkLevel'];
            $EnableText = 0;
        endif;
    break;
    case 4:
        $sqlSelect = "SELECT Image, ImageFormat, Description, WatermarkLevel FROM table3 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['Description']);
            $ImageName = $NameParts[0];
            $WatermarkLevel = $row['WatermarkLevel'];
            $EnableText = 0;
        endif;
    break;
    case 5:
        $sqlSelect = "SELECT Thumbnail, ImageFormat, Description FROM table3 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Thumbnail'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['Description']);
            $ImageName = $NameParts[0] . "_Thumbnail";
            $WatermarkLevel = 0;
            $EnableText = 0;
        endif;
    break;
    case 6:
        $sqlSelect = "SELECT Image, ImageFormat, Description, WatermarkLevel FROM table4 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $ImageName = str_replace("<br>", " - ", $row['Description']);
            $ImageName = strip_tags($ImageName);
            $WatermarkLevel = $row['WatermarkLevel'];
            $EnableText = 0;
        endif;
    break;
    case 7:
        $sqlSelect = "SELECT Thumbnail, ImageFormat, SortDescription FROM table4 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Thumbnail'];
            $mime_type = $row['ImageFormat'];
            $ImageName = str_replace("<br>", " - ", $row['Description']);
            $ImageName = strip_tags($ImageName) . "_Thumbnail";
            $WatermarkLevel = 0;
            $EnableText = 0;
        endif;
    break;
    case 8:
        $sqlSelect = "SELECT Image, ImageFormat, ItemName, WatermarkLevel FROM table5 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['ItemName']);
            $ImageName = $NameParts[0];
            $WatermarkLevel = $row['WatermarkLevel'];
            $EnableText = 0;
        endif;
    break;
    case 9:
        $sqlSelect = "SELECT Thumbnail, ImageFormat, ItemName FROM table5 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Thumbnail'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['ItemName']);
            $ImageName = $NameParts[0] . "_Thumbnail";
            $WatermarkLevel = 0;
            $EnableText = 0;
        endif;
    break;
    case 10:
        $sqlSelect = "SELECT Image, ImageFormat, Description FROM table6 WHERE Image IS NOT NULL AND RandomType = 1 ORDER BY RAND() LIMIT 1";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['Description']);
            $ImageName = $NameParts[0];
            $WatermarkLevel = 30;
            $EnableText = 0;
        endif;
    break;
    case 11:
        $sqlSelect = "SELECT Image, ImageFormat, Description FROM table6 WHERE Image IS NOT NULL AND RandomType = 2 ORDER BY RAND() LIMIT 1";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['Description']);
            $ImageName = $NameParts[0];
            $WatermarkLevel = 0;
            $EnableText = 0;
        endif;
    break;
    case 12:
        $sqlSelect = "SELECT Image, ImageFormat, Description FROM table6 WHERE Image IS NOT NULL AND RandomType = 3 ORDER BY RAND() LIMIT 1";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $NameParts = explode(".", $row['Description']);
            $ImageName = $NameParts[0];
            $WatermarkLevel = 80;
            $EnableText = 1;
        endif;
    break;
    case 13:
        $sqlSelect = "SELECT OriginalDoc, AdminName, MimeType, WatermarkLevel FROM table7 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['OriginalDoc'];
            $mime_type = $row['MimeType'];
            $ImageName = str_replace(" ", "_",$row['AdminName']);
            $WatermarkLevel = $row['WatermarkLevel'];
            $EnableText = 1;
        endif;
    break;
    default:
        $sqlSelect = "SELECT Image, ImageFormat, Description, WatermarkLevel FROM table2 WHERE ID=$ImageID";
        $row = DBConnect($sqlSelect, "Select", "db_name");
        if (is_array($row)) :
            $im = $row['Image'];
            $mime_type = $row['ImageFormat'];
            $ImageName = $row['Description'];
            $WatermarkLevel = $row['WatermarkLevel'];
            $EnableText = 1;
        endif;
endswitch;

if (isset($im) && isset($mime_type) && $mime_type !== "pdf" && $ImageType != 13) :
    $im = ImageCreateFromString($im);

    if (!isset($_SESSION['HideWatermark'])) :
        $ServerPath = getenv("DOCUMENT_ROOT");

        if ($WatermarkLevel && $WatermarkLevel != "0") :
            // For image-based watermark, lower right
            $WaterMark = ImageCreateFromString(DBLookup("SELECT Image FROM table3 WHERE ID=1", "db_name"));
            $wmX = ImageSx($im) -35;
            $wmY = ImageSy($im) -50;
            ImageCopyMerge($im, $WaterMark, $wmX, $wmY, 0, 0, imageSX($WaterMark), imageSY($WaterMark), $WatermarkLevel);
        endif;

        if ($EnableText && $ImageType != 12) :
            // For single-line text-type watermark lower center
            $string = "SiteName.com";
            $font = $ServerPath . "/internals/truetype/font1.ttf";
            $fontsize = 8;
            $FontColor = ImageColorAllocate($im, 200, 31, 31);
            $tsize = ImageTTFBBox($fontsize,0,$font,$string);
            $dx = abs($tsize[2]-$tsize[0]); // subtract lower right x from lower left x
            $x = ( ImageSx($im) - $dx );
            $y = ImageSy($im) - 5;
            ImageTTFText($im, $fontsize, 0, $x, $y, $FontColor, $font, $string);

        elseif ($EnableText && $ImageType == 12) :
            // For two-line text-type watermark, lower center
            $size = 250;
            $width = imagesx($im);
            $height = imagesy($im);
            $aspect_ratio = $height/$width;
            $new_w = $size;
            $new_h = abs($new_w * $aspect_ratio);

            $string1 = "presented by";
            $font1 = $ServerPath ."/internals/truetype/font2.ttf";
            $fontsize1 = 15;
            $FontColor = ImageColorAllocate($im, 200, 31, 31);
            $tsize1 = ImageTTFBBox($fontsize1,0,$font1,$string1);
            $dx1 = abs($tsize1[2]-$tsize1[0]);
            $x1 = ( ImageSx($im) - $dx1) / 2;
            $y1 = $new_h - 50;
            ImageTTFText($im, $fontsize1, 0, $x1, $y1, $FontColor, $font1, $string1);

            $string2 = "SiteName.com";
            $font2 = $ServerPath . "/internals/truetype/font1.ttf";
            $fontsize2 = 30;
            $FontColor = ImageColorAllocate($im, 200, 31, 31);
            $tsize2 = ImageTTFBBox($fontsize2,0,$font2,$string2);
            $dx2 = abs($tsize2[2]-$tsize2[0]);
            $x2 = ( ImageSx($im) - $dx2) / 2;
            $y2 = $new_h - 10;
            ImageTTFText($im, $fontsize2, 0, $x2, $y2, $FontColor, $font2, $string2);       
        endif;
    endif;

    $picBG = "255, 255, 255"; // RGB-value for background
    $picFG = "104, 104, 104"; // RGB-value for color levels

    $colsBG = explode(",", $picBG);
    $colsFG = explode(",", $picFG);
    $imagebgcolor = ImageColorAllocate($im, trim($colsBG[0]), trim($colsBG[1]), trim($colsBG[2]));
    $jpegQuality = 72;

    // Start headers
    Header ("Content-type: image/" . $mime_type);

    if (isset($_GET['Download'])) :
        $Replace =  array("e","\"","/","(",")","@",":");
        $ImageType = str_replace($Replace ,"", $mime_type);
        Header("Content-Disposition: attachment; filename=" . $ImageName . "." . $ImageType); 
    endif;

    // Add no-cache to headers
    Header("Pragma: no-cache");

    switch ($mime_type) :
        case "gif":
            ImageColorTransparent($im, $imagebgcolor);
            ImageGIF($im);
        break;
        case "jpeg":
            ImageJPEG($im, NULL, $jpegQuality);
        break;
        case "png":
            ImageColorTransparent($im, $imagebgcolor);
                ImagePNG($im);
        break;
        default:
            ImageJPEG($im, NULL, $jpegQuality);
    endswitch;

    ImageDestroy($im);
    echo $im;

elseif (isset($mime_type) && $mime_type !== "pdf" && $ImageType == 13) :
    Header("Pragma: no-cache");
    Header("Content-type: image/".$mime_type."\"");
    Header("Content-Disposition: attachment; filename=$ImageName");
    echo $im;
elseif (isset($mime_type) && $mime_type === "pdf") :
    Header("Pragma: no-cache");
    Header("Content-type: application/pdf");
    Header("Content-Disposition: attachment; filename=$ImageName");
    echo $im;
endif;

exit();

?>

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