如何在使用PHP上传图片之前检查/修复图片旋转 [英] How to check/fix image rotation before upload image using PHP

问题描述

上传使用iphone拍摄的图像时出现问题. 我正在尝试使用PHP和imgrotate函数自动确定是否需要将图像旋转到正确的位置，然后再将其上传到服务器.

I have a issiue when uploading a image taken using iphone. I am trying to use PHP and the imgrotate function to automaticly decide if the image needs to be rotated to the correct possition, before uploading it to the server.

我的html代码:

<form class="form-horizontal" method="post" enctype="multipart/form-data">  
     <div class="form-group">
        <div class="col-md-9">
            <div class="input-group">
                <span class="input-group-btn">
                    <span class="btn btn-default btn-file">
                        Choose img<input type="file" name="file" id="imgInp">
                    </span>
                </span>

            </div>
        </div>
    </div>
    <button type="submit">Send</button>
</form>

使用以下代码的PHP代码: 还返回错误:警告:imagerotate()期望参数1为资源，输入字符串.

The PHP code im using: Also return a error: Warning: imagerotate() expects parameter 1 to be resource, string given in.

有人针对这种情况有工作代码吗?

Anyone have a working code for this scenario?

<?php

$filename = $_FILES['file']['name'];
$exif = exif_read_data($_FILES['file']['tmp_name']);


 if (!empty($exif['Orientation'])) {
        switch ($exif['Orientation']) {
            case 3:
                $image = imagerotate($filename, -180, 0);
                break;
            case 6:
                $image = imagerotate($filename, 90, 0);
                break;
            case 8:
                $image = imagerotate($filename, -90, 0);
                break;
        } 
    }

    imagejpeg($image, $filename, 90);

?>

推荐答案

您使用的imagerotate错误.在传递文件名时，它期望第一个参数成为资源.检查手册

You are using imagerotate wrong. It expect first parameter to be resource while you are passing the filename. Check manual

尝试一下:

<?php

$filename = $_FILES['file']['name'];
$filePath = $_FILES['file']['tmp_name'];
$exif = exif_read_data($_FILES['file']['tmp_name']);
if (!empty($exif['Orientation'])) {
    $imageResource = imagecreatefromjpeg($filePath); // provided that the image is jpeg. Use relevant function otherwise
    switch ($exif['Orientation']) {
        case 3:
        $image = imagerotate($imageResource, 180, 0);
        break;
        case 6:
        $image = imagerotate($imageResource, -90, 0);
        break;
        case 8:
        $image = imagerotate($imageResource, 90, 0);
        break;
        default:
        $image = $imageResource;
    } 
}

imagejpeg($image, $filename, 90);

?>

不要忘记添加以下两行来释放内存:

Do not forget to free the memory by adding following two lines:

imagedestroy($imageResource);
imagedestroy($image);

这篇关于如何在使用PHP上传图片之前检查/修复图片旋转的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！