PHP read_exif_data和调整方向

Question

I am using the following code to rotate an uploaded jpeg image if the orientation is off. I am only having problems with images uploaded from iPhones and Android.

if(move_uploaded_file($_FILES['photo']['tmp_name'], $upload_path . $newfilename)){
            chmod($upload_path . $newfilename, 0755);
            $exif = exif_read_data($upload_path . $newfilename);
            $ort = $exif['IFD0']['Orientation'];
            switch($ort)
            {

                case 3: // 180 rotate left
                    $image->imagerotate($upload_path . $newfilename, 180, -1);
                    break;


                case 6: // 90 rotate right
                    $image->imagerotate($upload_path . $newfilename, -90, -1);
                    break;

                case 8:    // 90 rotate left
                    $image->imagerotate($upload_path . $newfilename, 90, -1);
                    break;
            }
            imagejpeg($image, $upload_path . $newfilename, 100);
            $success_message = 'Photo Successfully Uploaded';
        }else{
            $error_count++;
            $error_message = 'Error: Upload Unsuccessful<br />Please Try Again';
        }

Am I doing something wrong with the way I am reading the EXIF data from the jpeg? It is not rotating the images as it is supposed to.

This is what happens when I run a var_dump($exif);

array(41) {
    ["FileName"]=> string(36) "126e7c0efcac2b76b3320e6187d03cfd.JPG"
    ["FileDateTime"]=> int(1316545667)
    ["FileSize"]=> int(1312472)
    ["FileType"]=> int(2)
    ["MimeType"]=> string(10) "image/jpeg"
    ["SectionsFound"]=> string(30) "ANY_TAG, IFD0, THUMBNAIL, EXIF"
    ["COMPUTED"]=> array(8) {
        ["html"]=> string(26) "width="2048" height="1536""
        ["Height"]=> int(1536)
        ["Width"]=> int(2048)
        ["IsColor"]=> int(1)
        ["ByteOrderMotorola"]=> int(1)
        ["ApertureFNumber"]=> string(5) "f/2.8"
        ["Thumbnail.FileType"]=> int(2)
        ["Thumbnail.MimeType"]=> string(10) "image/jpeg" }
        ["Make"]=> string(5) "Apple"
        ["Model"]=> string(10) "iPhone 3GS"
        ["Orientation"]=> int(6)
        ["XResolution"]=> string(4) "72/1"
            ["YResolution"]=> string(4) "72/1" ["ResolutionUnit"]=> int(2) ["Software"]=> string(5) "4.3.5" ["DateTime"]=> string(19) "2011:09:16 21:18:46" ["YCbCrPositioning"]=> int(1) ["Exif_IFD_Pointer"]=> int(194) ["THUMBNAIL"]=> array(6) { ["Compression"]=> int(6) ["XResolution"]=> string(4) "72/1" ["YResolution"]=> string(4) "72/1" ["ResolutionUnit"]=> int(2) ["JPEGInterchangeFormat"]=> int(658) ["JPEGInterchangeFormatLength"]=> int(8231) } ["ExposureTime"]=> string(4) "1/15" ["FNumber"]=> string(4) "14/5" ["ExposureProgram"]=> int(2) ["ISOSpeedRatings"]=> int(200) ["ExifVersion"]=> string(4) "0221" ["DateTimeOriginal"]=> string(19) "2011:09:16 21:18:46" ["DateTimeDigitized"]=> string(19) "2011:09:16 21:18:46" ["ComponentsConfiguration"]=> string(4) "" ["ShutterSpeedValue"]=> string(8) "3711/949" ["ApertureValue"]=> string(9) "4281/1441" ["MeteringMode"]=> int(1) ["Flash"]=> int(32) ["FocalLength"]=> string(5) "77/20" ["SubjectLocation"]=> array(4) { [0]=> int(1023) [1]=> int(767) [2]=> int(614) [3]=> int(614) } ["FlashPixVersion"]=> string(4) "0100" ["ColorSpace"]=> int(1) ["ExifImageWidth"]=> int(2048) ["ExifImageLength"]=> int(1536) ["SensingMethod"]=> int(2) ["ExposureMode"]=> int(0) ["WhiteBalance"]=> int(0) ["SceneCaptureType"]=> int(0) ["Sharpness"]=> int(1) }

Answer 1

The documentation for imagerotate refers to a different type for the first parameter than you use:

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

Here is a small example for using this function:

function resample($jpgFile, $thumbFile, $width, $orientation) {
    // Get new dimensions
    list($width_orig, $height_orig) = getimagesize($jpgFile);
    $height = (int) (($width / $width_orig) * $height_orig);
    // Resample
    $image_p = imagecreatetruecolor($width, $height);
    $image   = imagecreatefromjpeg($jpgFile);
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
    // Fix Orientation
    switch($orientation) {
        case 3:
            $image_p = imagerotate($image_p, 180, 0);
            break;
        case 6:
            $image_p = imagerotate($image_p, -90, 0);
            break;
        case 8:
            $image_p = imagerotate($image_p, 90, 0);
            break;
    }
    // Output
    imagejpeg($image_p, $thumbFile, 90);
}