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我是一个 php 菜鸟，正在尝试创建一个图像大小调整脚本，将上传的图像缩小到更小的尺寸。使用下面的当前脚本，我可以显示原始图像。新的宽度和高度似乎没有注册。任何帮助表示赞赏。

    <?php

    if ($_SERVER['REQUEST_METHOD']=='POST') {
      if (isset($_FILES['image']['tmp_name'])) {
        if ($_FILES['image']['error']==0){
        $new_dir = '/PHP_MySQL_Practice/uploaded/images';
        $fullpath = $_SERVER['DOCUMENT_ROOT'].$new_dir;
        if(!is_dir($fullpath)) {
            mkdir($fullpath, 0777, TRUE); 
        }
        //get file name and type(extension)
        $name = $_FILES['image']['name'];
        $type = $_FILES['image']['type'];

        //separate image name after first "dot"
        $separated = explode(".", $name);
        //get string before the dot which was stored as the 1st item in the separated array.
        $first = $separated[0];
        //use php function pathinfo to get extension of image file
        $ext = pathinfo($name, PATHINFO_EXTENSION);
        //concatenate current timestamp (to avoid file overwrites) with the extracted file 'firstname' and add the extension
        $name = time().'_'.$first.'.'.$ext;
        $target = $fullpath.'/'.$name;

        if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) {

            resizeImage($target, $name);
            echo '<img src="' . $target . '"/>';

        }

    }
    else {

        echo 'there was an error in saving ur image file.';
    }
}   
else {

    echo 'ur image could not be uploaded.';
}
    }
    else {
    ?>
<form method="POST" enctype="multipart/form-data">
    <label>upload image: </label>
    <input type="file" name="image" />
    <input type="submit" />
</form> 
    <?php   
    }

    //function to resize image
    function resizeImage($dir, $img) {
list($src_w, $src_h) = getimagesize($dir);
$max_w = 150;
$max_h = 150;
if ($src_w > $max_w) {
    $ratio = $max_w / $src_w;
    $new_img_w = $src_w * $ratio;
}
else if ($src_h > $max_h) {
    $ratio = $max_h / $src_h;
    $new_img_h = $src_h * $ratio;
}
$img_mime_type = getimagesize($dir);
switch ($img_mime_type['mime']) {
    case 'image/jpeg':
    case 'image/pjpeg':
        $src = imagecreatefromjpeg($dir);
        return $src;
        break;
    case 'image/gif':
        $src = imagecreatefromgif($dir);
        return $src;
        break;
    case 'image/png':
        $src = imagecreatefrompng($dir);
        return $src;
        break;
    default:
        return FALSE;
        break;
}
$new_img = imagecreatetruecolor($new_img_w, $new_img_h);
imagecopyresampled($new_img, $src, 0, 0, 0, 0, $new_img_w, $new_img_h, $max_w, $max_h);
switch ($img_mime_type['mime']) {
    case 'image/jpeg':
    case 'image/pjpeg':
        imagejpeg($new_img, $dir, 100);
        break;
    case 'image/gif':
        imagegif($new_img, $dir);
        break;
    case 'image/png':
        imagepng($new_img, $dir);
        break;
    default:
        return FALSE;
        break;
}

imagedestroy($src);
imagedestroy($new_img);
    }
    ?>
4

4 回答 4

3

那里有一些缺陷

  1. imagegif只有2个参数$im和保存位置
  2. imagepng压缩级别从 0 到 9 而不是 100
  3. 您没有保存图像，null应该imagejpeg($new_img, null, 100);更改为$dir
  4. 你的最后一个功能imagdestroy($src);是错误的，应该是imagedestroy($src);

你switch应该是：

switch ($img_mime_type['mime']) {
    case 'image/jpeg':
    case 'image/pjpeg':
        imagejpeg($new_img, $dir, 100);
        break;
    case 'image/gif':
        imagegif($new_img, $dir);
        break;
    case 'image/png':
        imagepng($new_img, $dir);
        break;
    default:
        return FALSE;
        break;
}

你的调整大小功能：

function resizeImage($dir, $img) {
    //echo $dir; die;
    list($src_w, $src_h) = getimagesize($dir);
    $max_w = 150;
    $max_h = 150;
    if ($src_w > $max_w) {
        $ratio = $max_w / $src_w;
        $max_w = $src_w * $ratio;
    }
    else if ($src_h > $max_h) {
        $ratio = $max_h / $src_h;
        $max_h = $src_h * $ratio;
    }
    $img_mime_type = getimagesize($dir);
    $src = imagecreatefromstring(file_get_contents($dir));
    $new_img = imagecreatetruecolor($max_w, $max_h);
    imagecopyresampled($new_img, $src, 0, 0, 0, 0, $max_w, $max_h, $src_w, $src_h);
    switch ($img_mime_type['mime']) {
        case 'image/jpeg':
        case 'image/pjpeg':
            imagejpeg($new_img, $dir, 100);
            break;
        case 'image/gif':
            imagegif($new_img, $dir);
            break;
        case 'image/png':
            imagepng($new_img, $dir);
            break;
        default:
            return FALSE;
            break;
    }

    imagedestroy($src);
    imagedestroy($new_img);
}
于 2012-09-10T05:11:12.270 回答
0

您不是在保存图像，而是在输出图像的内容。如果您查看 imagejpeg 的文档，您会看到第二个参数是您要保存图像的路径。因此，将您的第二个参数（null）更改为您想要保存调整大小的图像的任何位置。

于 2012-09-10T05:09:37.557 回答
0

使用以下函数调整图像大小

function image_resize($image, $maxWidth, $maxHeight = null)
{
        $file = $image;
        $file_headers = @get_headers($file);

        //validate file not exists
        if( isset($file_headers[0]) && strpos($file_headers[0], '404') ) {
            return;
        }

    $arrayUploadPath = wp_upload_dir();
    $fileUploadSubDir = str_replace(basename($image),'', str_replace($arrayUploadPath['baseurl'], '', $image));
    $fileUploadDir = $arrayUploadPath['basedir'] . $fileUploadSubDir;

    //validate sour ce file existance
    if(!file_exists($fileUploadDir . basename($src))) return null;

    $fileUploadUrl = $arrayUploadPath['baseurl'] . $fileUploadSubDir;
    $srcFileName = $fileUploadDir . basename($image);
    $srcSize = getimagesize($srcFileName);
    $width = $srcSize[0];
    $height = $srcSize[1];

    if( empty($maxHeight) ) {
        $size = wp_constrain_dimensions($width, $height, $maxWidth);
        $maxHeight = $size[1];
    }

    //fix for image_resize_dimensions() constraint in image_resize() function
    if($maxHeight >= $height) $maxHeight = $height - 1;

    $newImage = image_resize($srcFileName, $maxWidth, $maxHeight);

    $newFileNameUrl = !empty($newImage) && !is_object($newImage) ? $fileUploadUrl . basename($newImage) : null;

    return $newFileNameUrl;
}
于 2012-09-10T05:13:42.673 回答
0

试试这个功能...

在此函数中，您可以根据需要传递高度和宽度，因为共有三种可能性可以按比例调整图像大小

  1. 如果高度大于宽度，那么您必须根据高度调整大小。
  2. 如果宽度大于宽度，那么您必须调整宽度。
  3. 调整高度和宽度。

这是示例，

//first of all get Height and width of image 

 function getHeight($image) {
    $sizes = getimagesize($image);
    $height = $sizes[1];
    return $height;
}

//You do not need to alter these functions
function getWidth($image) {
    $sizes = getimagesize($image);
    $width = $sizes[0];
    return $width;
}

现在在这里调整所需的尺寸我正在使用 500px（高度和宽度都）

    $width = $this->getWidth($fullpath);
    $height = $this->getHeight($fullpath);

     $profilecroppedthumb = UPLOAD_PATH."FILENAME_WITH_EXTENSION";
     $fullpath = $uploadDirectory.$filename.'.'.$ext;

        if ($width >= 500 && $height >= 500) {
            thumb($fullpath, $profilecroppedthumb, "500", "500");
        }
        elseif($width >= 500 && $height <= 500)
        {
            thumb($fullpath, $profilecroppedthumb, "500", "");
        } 
        elseif($width <= 500 && $height >= 500)
        {
            thumb($fullpath, $profilecroppedthumb, "", "500");
        }
        else
        {
            $target = fopen($profilecroppedthumb, "w");
            fseek($temp, 0, SEEK_SET);
            stream_copy_to_stream($temp, $target);
            fclose($target);
        } 
 function thumb($file, $save, $width="", $height="")
{   
    //GD-Lib > 2.0 only!
    //@unlink($save);

    //get sizes else stop

    if (!$infos = @getimagesize($file)) {
    //echo $infos = @getimagesize($file); exit('saf');
        return false;
    }

    // keep proportions
    $iWidth = $infos[0];
    $iHeight = $infos[1];
    $iRatioW = $width / $iWidth;
    $iRatioH = $height / $iHeight;


    if($height == "" ) {
        if ($iRatioW < $iRatioH) {
                $iNewW = $iWidth * $iRatioW;
                $iNewH = $iHeight * $iRatioW;
            } else {
                $iNewW = $iWidth * $iRatioW;
                $iNewH = $iHeight * $iRatioW;
            }
    }
    elseif ($width == "")
    {
    if ($iRatioW < $iRatioH) {
                $iNewW = $iWidth * $iRatioH;
                $iNewH = $iHeight * $iRatioH;
            } else {
                $iNewW = $iWidth * $iRatioH;
                $iNewH = $iHeight * $iRatioH;
            }
    }
    else 
    {
        if ($iRatioW < $iRatioH) {
            $iNewW = $iWidth * $iRatioW;
            $iNewH = $iHeight * $iRatioW;
        } else {

            $iNewW = $iWidth * $iRatioH;
            $iNewH = $iHeight * $iRatioH;


        }
    }
    //$iNewW = $width;
    //$iNewH = $height;

    //Don't resize images which are smaller than thumbs
    if ($infos[0] < $width && $infos[1] < $height) {
        $iNewW = $infos[0];
        $iNewH = $infos[1];
    }

    if($infos[2] == 1) {
        /*
        * Image is typ gif
        */
        $imgA = imagecreatefromgif($file);
        $imgB = imagecreate($iNewW,$iNewH);

        //keep gif transparent color if possible
        if(function_exists('imagecolorsforindex') && function_exists('imagecolortransparent')) {
            $transcolorindex = imagecolortransparent($imgA);
                //transparent color exists
                if($transcolorindex >= 0 ) {
                    $transcolor = imagecolorsforindex($imgA, $transcolorindex);
                    $transcolorindex = imagecolorallocate($imgB, $transcolor['red'], $transcolor['green'], $transcolor['blue']);
                    imagefill($imgB, 0, 0, $transcolorindex);
                    imagecolortransparent($imgB, $transcolorindex);
                //fill white
                } else {
                    $whitecolorindex = @imagecolorallocate($imgB, 255, 255, 255);
                    imagefill($imgB, 0, 0, $whitecolorindex);
                }
        //fill white
        } else {
            $whitecolorindex = imagecolorallocate($imgB, 255, 255, 255);
            imagefill($imgB, 0, 0, $whitecolorindex);
        }
        imagecopyresampled($imgB, $imgA, 0, 0, 0, 0, $iNewW, $iNewH, $infos[0], $infos[1]);
        imagegif($imgB, $save);        

    } elseif($infos[2] == 2) {
        /*
        * Image is typ jpg

        */
        $imgA = imagecreatefromjpeg($file);
        $imgB = imagecreatetruecolor($iNewW,$iNewH);
        imagecopyresampled($imgB, $imgA, 0, 0, 0, 0, $iNewW, $iNewH, $infos[0], $infos[1]);
        imagejpeg($imgB, $save,100);

    } elseif($infos[2] == 3) {
        /*
        * Image is typ png
        */
        $imgA = imagecreatefrompng($file);
        $imgB = imagecreatetruecolor($iNewW, $iNewH);
        imagealphablending($imgB, false);
        imagecopyresampled($imgB, $imgA, 0, 0, 0, 0, $iNewW, $iNewH, $infos[0], $infos[1]);
        imagesavealpha($imgB, true);
        imagepng($imgB, $save,100);
    } else {
        return false;
    }

    return true;
}

希望这有助于...

于 2012-09-10T05:57:46.430 回答