Das Hochladen von Bildern auf einer mobilen Safari wechselt von der vertikalen zur horizontalen Verarbeitung

Beim Hochladen eines Bildes in Mobile Safari wird das vertikale Foto zu einem horizontalen Foto. Das folgende Programmfragment verwendet die Bild-Exif-Informationen, um das Bild zurückzudrehen. Der Code wird von der offiziellen Website von php.net kopiert.

http://php.net/manual/zh/function.exif-read-data.php

<?<span style="color: #000000;">php
</span><span style="color: #800080;">$image</span> = imagecreatefromstring(<span style="color: #008080;">file_get_contents</span>(<span style="color: #800080;">$_FILES</span>['image_upload']['tmp_name'<span style="color: #000000;">]));
</span><span style="color: #800080;">$exif</span> = exif_read_data(<span style="color: #800080;">$_FILES</span>['image_upload']['tmp_name'<span style="color: #000000;">]);
</span><span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$exif</span>['Orientation'<span style="color: #000000;">])) {
    </span><span style="color: #0000ff;">switch</span>(<span style="color: #800080;">$exif</span>['Orientation'<span style="color: #000000;">]) {
        </span><span style="color: #0000ff;">case</span> 8:
            <span style="color: #800080;">$image</span> = imagerotate(<span style="color: #800080;">$image</span>,90,0<span style="color: #000000;">);
            </span><span style="color: #0000ff;">break</span><span style="color: #000000;">;
        </span><span style="color: #0000ff;">case</span> 3:
            <span style="color: #800080;">$image</span> = imagerotate(<span style="color: #800080;">$image</span>,180,0<span style="color: #000000;">);
            </span><span style="color: #0000ff;">break</span><span style="color: #000000;">;
        </span><span style="color: #0000ff;">case</span> 6:
            <span style="color: #800080;">$image</span> = imagerotate(<span style="color: #800080;">$image</span>,-90,0<span style="color: #000000;">);
            </span><span style="color: #0000ff;">break</span><span style="color: #000000;">;
    }
}
</span><span style="color: #008000;">//以下代码自行处理即可</span>
?>