图像大小调整PHP

问题描述

我仍然是一个PHP的图像处理或文件处理的新手。

以下

我使用简单的html表单发布图像文件并通过php上传。
当我尝试和改变我的代码，以适应更大的文件（即调整大小）我得到一个错误。
已经在网上搜索，但无法找到任何真正简单的东西。

$ $ $ $ $ $ $ $ $ $ $文件格式（$ _ FILES ['image' ] [ 'tmp_name的值']）;

//将大小与我们定义的最大大小进行比较，如果大于
则打印错误if（$ size == FALSE）
{
$ errors = 1;
} else if（$ size [0]> 300）{//如果width大于300px
$ aspectRatio = 300 / $ size [0];
$ newWidth = round（$ aspectRatio * $ size [0]）;
$ newHeight = round（$ aspectRatio * $ size [1]）;
$ imgHolder = imagecreatetruecolor（$ newWidth，$ newHeight）;
}

$ newname = ROOTPATH.LOCALDIR。/ images /\".$ image_name; // image_name生成

$ copy = imagecopyresized（$ imgHolder，$ _FILES ['image'] ['tmp_name']，0，0，0，0，$ newWidth，$ newHeight，$ size [0]，$ size [1]）;
move_uploaded_file（$ copy，$ newname）; //我要将文件移动到$ newname

的位置，我得到的错误是：
$ b

I'm still a newbie regarding image handling or file handling for that matter in PHP.

Would appreciate any input regarding the following

I post an image file using a simple html form and upload it via php.When i try and alter my code to accomodate larger files (i.e. resize) I get an error.Have been searching online but cant find anything really simple.

$size = getimagesize($_FILES['image']['tmp_name']);

//compare the size with the maxim size we defined and print error if bigger
if ($size == FALSE)
{
    $errors=1;
}else if($size[0] > 300){   //if width greater than 300px
    $aspectRatio = 300 / $size[0];
    $newWidth = round($aspectRatio * $size[0]);
    $newHeight = round($aspectRatio * $size[1]);
    $imgHolder = imagecreatetruecolor($newWidth,$newHeight);
}

$newname= ROOTPATH.LOCALDIR."/images/".$image_name; //image_name is generated

$copy = imagecopyresized($imgHolder, $_FILES['image']['tmp_name'], 0, 0, 0, 0, $newWidth, $newHeight, $size[0], $size[1]);
move_uploaded_file($copy, $newname); //where I want to move the file to the location of $newname

The error I get is:

Thanks in advance

---

Thanks for all your input, i've changed it to this

$oldImage = imagecreatefromstring(file_get_contents($_FILES['image']['tmp_name']));
$copy = imagecopyresized($imgHolder, $oldImage, 0, 0, 0, 0, $newWidth, $newHeight, $size[0], $size[1]);
if(!move_uploaded_file($copy, $newname)){
    $errors=1;
}

Not getting a PHP log error but its not saving :(

Any ideas?

Thanks again

---

Result

Following works.

$oldImage = imagecreatefromjpeg($img);
$imageHolder = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresized($imageHolder, $oldImage, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
imagejpeg($imageHolder, $newname, 100);

Thanks for everyones help

解决方案

imagecopyresized takes an image resource as its second parameter, not a file name. You'll need to load the file first. If you know the file type, you can use imagecreatefromFILETYPE to load it. For example, if it's a JPEG, use imagecreatefromjpeg and pass that the file name - this will return an image resource.

If you don't know the file type, all is not lost. You can read the file in as a string and use imagecreatefromstring (which detects file types automatically) to load it as follows:

$oldImage = imagecreatefromstring(file_get_contents($_FILES['image']['tmp_name']));

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