Question

下面提供的脚本＆＃34; res.php＆＃34;用于缩放然后在html页面的HEADER css中使用的图像。根据＆＃34; CID＆＃34;来调用图像。（俱乐部ID）。每个俱乐部都有存储在数据库中的信息，包括一个名为club_header的信息。 club_header是一个存储绝对图像位置（文件系统或Web）的VARCHAR。＆＃34; res.php＆＃34;功能是调用图像并将其输出到浏览器，并将图像重新调整为任何设置的大小。默认情况下，设置为960 x 200.

但是由于某些原因，脚本没有做它必须做的事情而是输出一个损坏的图像。问题可能与代码有什么关系？

如果需要，可以使用某些服务器+ php信息

服务器： Apache v2.2.21，PHP v5.3.8，SQL v5.5.16，GD v2.0.34

PHP.ini： max_execution_time = 300，max_input_time = 60，memory_limit = 208M，post_max_size = 24M

＆＃34; res.php＆＃34;源代码

require("php/db.class.php");

function scaleImageFileToBlob($file) {

    $file = $_GET['cid'];

    $query = mysql_query("SELECT * FROM clubs WHERE club_id = '".$_GET['cid']."'");
    $obj = mysql_fetch_array($query);
    $photoObj = $obj['club_header'];

    $source_pic = $photoObj;
    $max_width = 960;
    $max_height = 200;

    list($width, $height, $image_type) = getimagesize($file);

    switch ($image_type)
    {
        case 1: $src = imagecreatefromgif($file); break;
        case 2: $src = imagecreatefromjpeg($file);  break;
        case 3: $src = imagecreatefrompng($file); break;
        default: return '';  break;
    }

    $x_ratio = $max_width / $width;
    $y_ratio = $max_height / $height;

    if( ($width <= $max_width) && ($height <= $max_height) ){
        $tn_width = $width;
        $tn_height = $height;
        }elseif (($x_ratio * $height) < $max_height){
            $tn_height = ceil($x_ratio * $height);
            $tn_width = $max_width;
        }else{
            $tn_width = ceil($y_ratio * $width);
            $tn_height = $max_height;
    }

    $tmp = imagecreatetruecolor($tn_width,$tn_height);

    /* Check if this image is PNG or GIF, then set if Transparent*/
    if(($image_type == 1) OR ($image_type==3))
    {
        imagealphablending($tmp, false);
        imagesavealpha($tmp,true);
        $transparent = imagecolorallocatealpha($tmp, 255, 255, 255, 127);
        imagefilledrectangle($tmp, 0, 0, $tn_width, $tn_height, $transparent);
    }
    imagecopyresampled($tmp,$src,0,0,0,0,$tn_width, $tn_height,$width,$height);

    /*
     * imageXXX() only has two options, save as a file, or send to the browser.
     * It does not provide you the oppurtunity to manipulate the final GIF/JPG/PNG file stream
     * So I start the output buffering, use imageXXX() to output the data stream to the browser, 
     * get the contents of the stream, and use clean to silently discard the buffered contents.
     */
    ob_start();

    switch ($image_type)
    {
        case 1: imagegif($tmp); break;
        case 2: imagejpeg($tmp, NULL, 100);  break; // best quality
        case 3: imagepng($tmp, NULL, 0); break; // no compression
        default: echo ''; break;
    }

    $final_image = ob_get_contents();

    ob_end_clean();

    return $final_image;

}

echo scaleImageFileToBlob($file);

提前谢谢。

Answer 1

您可能需要在图像输出之前发送正确的标题，例如

header('Content-Type: image/png');

header('Content-Type: image/jpeg');

header('Content-Type: image/gif');

PHP图像缩放不起作用

1 个答案: