使用前需安装 ImageMagick 客户端和 php Imagick 扩展类库
可解决上传图片在ios 下翻转的问题。

使用方法

$imagick = new \lib_image_imagick();

$width = 200px;
$height = 200px;

$thumb = 'thumb.jpg';
$file = 'test.jpg';
$imagick->open($file); //图片路径

$imagick->resize_to($width, $height, 'center');  //要截取缩略图的大小,
$imagick->save_to($thumb); //保存到新的路径

类库

<?php

namespace app\common\lib\image;

class lib_image_imagick
{
    private $image = null;
    private $type = null;
    // 构造函数
    public function __construct(){}

    // 析构函数
    public function __destruct()
    {
        if($this->image!==null) $this->image->destroy();
    }
    // 载入图像
    public function open($path)
    {
        $this->image = new Imagick( $path );
        if($this->image)
        {
            $this->type = strtolower($this->image->getImageFormat());
        }

        return  $this->autorotate($this->image);
    }
    public function autorotate(Imagick $image)
    {
        switch ($image->getImageOrientation()) {
            case Imagick::ORIENTATION_TOPLEFT:
                break;
            case Imagick::ORIENTATION_TOPRIGHT:
                $image->flopImage();
                break;
            case Imagick::ORIENTATION_BOTTOMRIGHT:
                $image->rotateImage("#000", 180);
                break;
            case Imagick::ORIENTATION_BOTTOMLEFT:
                $image->flopImage();
                $image->rotateImage("#000", 180);
                break;
            case Imagick::ORIENTATION_LEFTTOP:
                $image->flopImage();
                $image->rotateImage("#000", -90);
                break;
            case Imagick::ORIENTATION_RIGHTTOP:
                $image->rotateImage("#000", 90);
                break;
            case Imagick::ORIENTATION_RIGHTBOTTOM:
                $image->flopImage();
                $image->rotateImage("#000", 90);
                break;
            case Imagick::ORIENTATION_LEFTBOTTOM:
                $image->rotateImage("#000", -90);
                break;
            default: // Invalid orientation
                break;
        }
        $image->setImageOrientation(Imagick::ORIENTATION_TOPLEFT);
        return $image;
    }
    public function crop($x=0, $y=0, $width=null, $height=null)
    {
        if($width==null) $width = $this->image->getImageWidth()-$x;
        if($height==null) $height = $this->image->getImageHeight()-$y;
        if($width<=0 || $height<=0) return;

        if($this->type=='gif')
        {
            $image = $this->image;
            $canvas = new Imagick();

            $images = $image->coalesceImages();
            foreach($images as $frame){
                $img = new Imagick();
                $img->readImageBlob($frame);
                $img->cropImage($width, $height, $x, $y);
                $canvas->addImage( $img );
                $canvas->setImageDelay( $img->getImageDelay() );
                $canvas->setImagePage($width, $height, 0, 0);
            }

            $image->destroy();
            $this->image = $canvas;
        }
        else
        {
            $this->image->cropImage($width, $height, $x, $y);
        }
    }
    /*
    * 更改图像大小
    $fit: 适应大小方式
    'force': 把图片强制变形成 $width X $height 大小
    'scale': 按比例在安全框 $width X $height 内缩放图片, 输出缩放后图像大小 不完全等于 $width X $height
    'scale_fill': 按比例在安全框 $width X $height 内缩放图片,安全框内没有像素的地方填充色, 使用此参数时可设置背景填充色 $bg_color = array(255,255,255)(红,绿,蓝, 透明度) 透明度(0不透明-127完全透明))
    其它: 智能模能 缩放图像并载取图像的中间部分 $width X $height 像素大小
    $fit = 'force','scale','scale_fill' 时: 输出完整图像
    $fit = 图像方位值 时, 输出指定位置部分图像
    字母与图像的对应关系如下:

    north_west   north   north_east

    west         center        east

    south_west   south   south_east

    */
    public function resize_to($width = 100, $height = 100, $fit = 'center', $fill_color = array(255,255,255,0) )
    {

        switch($fit)
        {
            case 'force':
                if($this->type=='gif')
                {
                    $image = $this->image;
                    $canvas = new Imagick();

                    $images = $image->coalesceImages();
                    foreach($images as $frame){
                        $img = new Imagick();
                        $img->readImageBlob($frame);
                        $img->thumbnailImage( $width, $height, false );
                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                    }
                    $image->destroy();
                    $this->image = $canvas;
                }
                else
                {
                    $this->image->thumbnailImage( $width, $height, false );
                }
                break;
            case 'scale':
                if($this->type=='gif')
                {
                    $image = $this->image;
                    $images = $image->coalesceImages();
                    $canvas = new Imagick();
                    foreach($images as $frame){
                        $img = new Imagick();
                        $img->readImageBlob($frame);
                        $img->thumbnailImage( $width, $height, true );
                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                    }
                    $image->destroy();
                    $this->image = $canvas;
                }
                else
                {
                    $this->image->thumbnailImage( $width, $height, true );
                }
                break;
            case 'scale_fill':
                $size = $this->image->getImagePage();
                $src_width = $size['width'];
                $src_height = $size['height'];

                $x = 0;
                $y = 0;

                $dst_width = $width;
                $dst_height = $height;
                if($src_width*$height > $src_height*$width)
                {
                    $dst_height = intval($width*$src_height/$src_width);
                    $y = intval( ($height-$dst_height)/2 );
                }
                else
                {
                    $dst_width = intval($height*$src_width/$src_height);
                    $x = intval( ($width-$dst_width)/2 );
                }
                $image = $this->image;
                $canvas = new Imagick();

                $color = 'rgba('.$fill_color[0].','.$fill_color[1].','.$fill_color[2].','.$fill_color[3].')';
                if($this->type=='gif')
                {
                    $images = $image->coalesceImages();
                    foreach($images as $frame)
                    {
                        $frame->thumbnailImage( $width, $height, true );
                        $draw = new ImagickDraw();
                        $draw->composite($frame->getImageCompose(), $x, $y, $dst_width, $dst_height, $frame);
                        $img = new Imagick();
                        $img->newImage($width, $height, $color, 'gif');
                        $img->drawImage($draw);
                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                        $canvas->setImagePage($width, $height, 0, 0);
                    }
                }
                else
                {
                    $image->thumbnailImage( $width, $height, true );

                    $draw = new ImagickDraw();
                    $draw->composite($image->getImageCompose(), $x, $y, $dst_width, $dst_height, $image);

                    $canvas->newImage($width, $height, $color, $this->get_type() );
                    $canvas->drawImage($draw);
                    $canvas->setImagePage($width, $height, 0, 0);
                }
                $image->destroy();
                $this->image = $canvas;
                break;
            default:
                $size = $this->image->getImagePage();
                $src_width = $size['width'];
                $src_height = $size['height'];

                $crop_x = 0;
                $crop_y = 0;

                $crop_w = $src_width;
                $crop_h = $src_height;

                if($src_width*$height > $src_height*$width)
                {
                    $crop_w = intval($src_height*$width/$height);
                }
                else
                {
                    $crop_h = intval($src_width*$height/$width);
                }

                switch($fit)
                {
                    case 'north_west':
                        $crop_x = 0;
                        $crop_y = 0;
                        break;
                    case 'north':
                        $crop_x = intval( ($src_width-$crop_w)/2 );
                        $crop_y = 0;
                        break;
                    case 'north_east':
                        $crop_x = $src_width-$crop_w;
                        $crop_y = 0;
                        break;
                    case 'west':
                        $crop_x = 0;
                        $crop_y = intval( ($src_height-$crop_h)/2 );
                        break;
                    case 'center':
                        $crop_x = intval( ($src_width-$crop_w)/2 );
                        $crop_y = intval( ($src_height-$crop_h)/2 );
                        break;
                    case 'east':
                        $crop_x = $src_width-$crop_w;
                        $crop_y = intval( ($src_height-$crop_h)/2 );
                        break;
                    case 'south_west':
                        $crop_x = 0;
                        $crop_y = $src_height-$crop_h;
                        break;
                    case 'south':
                        $crop_x = intval( ($src_width-$crop_w)/2 );
                        $crop_y = $src_height-$crop_h;
                        break;
                    case 'south_east':
                        $crop_x = $src_width-$crop_w;
                        $crop_y = $src_height-$crop_h;
                        break;
                    default:
                        $crop_x = intval( ($src_width-$crop_w)/2 );
                        $crop_y = intval( ($src_height-$crop_h)/2 );
                }

                $image = $this->image;
                $canvas = new Imagick();

                if($this->type=='gif')
                {
                    $images = $image->coalesceImages();
                    foreach($images as $frame){
                        $img = new Imagick();
                        $img->readImageBlob($frame);
                        $img->cropImage($crop_w, $crop_h, $crop_x, $crop_y);
                        $img->thumbnailImage( $width, $height, true );

                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                        $canvas->setImagePage($width, $height, 0, 0);
                    }
                }
                else
                {
                    $image->cropImage($crop_w, $crop_h, $crop_x, $crop_y);
                    $image->thumbnailImage( $width, $height);
                    // $image->thumbnailImage( $width, $height ,true);
                    $canvas->addImage( $image );
                    $canvas->setImagePage($width, $height, 0, 0);
                }
                $image->destroy();
                $this->image = $canvas;
        }

    }

    // 添加水印图片
    public function add_watermark($path, $x = 0, $y = 0)
    {
        $watermark = new Imagick($path);
        $draw = new ImagickDraw();
        $draw->composite($watermark->getImageCompose(), $x, $y, $watermark->getImageWidth(), $watermark->getimageheight(), $watermark);
        if($this->type=='gif')
        {
            $image = $this->image;
            $canvas = new Imagick();
            $images = $image->coalesceImages();
            foreach($image as $frame)
            {
                $img = new Imagick();
                $img->readImageBlob($frame);
                $img->drawImage($draw);

                $canvas->addImage( $img );
                $canvas->setImageDelay( $img->getImageDelay() );
            }
            $image->destroy();
            $this->image = $canvas;
        }
        else
        {
            $this->image->drawImage($draw);
        }
    }

    // 添加水印文字
    public function add_text($text, $x = 0 , $y = 0, $angle=0, $style=array())
    {
        $draw = new ImagickDraw();
        if(isset($style['font'])) $draw->setFont($style['font']);
        if(isset($style['font_size'])) $draw->setFontSize($style['font_size']);
        if(isset($style['fill_color'])) $draw->setFillColor($style['fill_color']);
        if(isset($style['under_color'])) $draw->setTextUnderColor($style['under_color']);

        if($this->type=='gif')
        {
            foreach($this->image as $frame)
            {
                $frame->annotateImage($draw, $x, $y, $angle, $text);
            }
        }
        else
        {
            $this->image->annotateImage($draw, $x, $y, $angle, $text);
        }
    }

    // 保存到指定路径
    public function save_to( $path )
    {
        //压缩图片质量
        $this->image->setImageFormat('JPEG');
        $this->image->setImageCompression(Imagick::COMPRESSION_JPEG);
        $a = $this->image->getImageCompressionQuality() * 0.60;
        if ($a == 0) {
            $a = 60;
        }
        $this->image->setImageCompressionQuality($a);
        $this->image->stripImage();

        if ($this->type == 'gif') {
            $this->image->writeImages ( $path, true );
        } else {
            $this->image->writeImage ( $path );
        }

    }
    // 输出图像
    public function output($header = true)
    {
        if($header) header('Content-type: '.$this->type);
        echo $this->image->getImagesBlob();
    }

    public function get_width()
    {
        $size = $this->image->getImagePage();
        return $size['width'];
    }

    public function get_height()
    {
        $size = $this->image->getImagePage();
        return $size['height'];
    }
    // 设置图像类型, 默认与源类型一致
    public function set_type( $type='png' )
    {
        $this->type = $type;
        $this->image->setImageFormat( $type );
    }
    // 获取源图像类型
    public function get_type()
    {
        return $this->type;
    }

    // 当前对象是否为图片
    public function is_image()
    {
        if( $this->image )
            return true;
        else
            return false;
    }

    public function thumbnail($width = 100, $height = 100, $fit = true){ $this->image->thumbnailImage( $width, $height, $fit );} // 生成缩略图 $fit为真时将保持比例并在安全框 $width X $height 内生成缩略图片
    /*
    添加一个边框
    $width: 左右边框宽度
    $height: 上下边框宽度
    $color: 颜色: RGB 颜色 'rgb(255,0,0)' 或 16进制颜色 '#FF0000' 或颜色单词 'white'/'red'...
    */
    public function border($width, $height, $color='rgb(220, 220, 220)')
    {
        $color=new ImagickPixel();
        $color->setColor($color);
        $this->image->borderImage($color, $width, $height);
    }

    public function blur($radius, $sigma){$this->image->blurImage($radius, $sigma);} // 模糊
    public function gaussian_blur($radius, $sigma){$this->image->gaussianBlurImage($radius, $sigma);} // 高斯模糊
    public function motion_blur($radius, $sigma, $angle){$this->image->motionBlurImage($radius, $sigma, $angle);} // 运动模糊
    public function radial_blur($radius){$this->image->radialBlurImage($radius);} // 径向模糊
    public function add_noise($type=null){$this->image->addNoiseImage($type==null?imagick::NOISE_IMPULSE:$type);} // 添加噪点

    public function level($black_point, $gamma, $white_point){$this->image->levelImage($black_point, $gamma, $white_point);} // 调整色阶
    public function modulate($brightness, $saturation, $hue){$this->image->modulateImage($brightness, $saturation, $hue);} // 调整亮度、饱和度、色调
    public function charcoal($radius, $sigma){$this->image->charcoalImage($radius, $sigma);} // 素描
    public function oil_paint($radius){$this->image->oilPaintImage($radius);} // 油画效果

    public function flop(){$this->image->flopImage();} // 水平翻转
    public function flip(){$this->image->flipImage();} // 垂直翻转
}

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