1 <?php  2 class ImageResize  3 {  4     private $image;  5     private $img_des;  6     private $image_type;  7     private $permissions;  8     private $compression;  9   10     /** 11      * 构造函数 12      * @param string $img_src     源图片 13      * @param string $img_des     保存图片对象 14      * @param int    $compression 压缩比率，范围0-100(0:压缩比最高，100：压缩比最低) 15      * @param null   $permissions 改变文件模式 16      *                            mode 参数由 4 个数字组成： 17      *                            第一个数字永远是 0 18      *                            第二个数字规定所有者的权限 19      *                            第二个数字规定所有者所属的用户组的权限 20      *                            第四个数字规定其他所有人的权限 21      *                            1 - 执行权限，2 - 写权限，4 - 读权限 22      */ 23     function __construct($img_src, $img_des = NULL, $compression = 75, $permissions = null) 24     { 25         $image_info = getimagesize($img_src); 26   27         $this->img_des = $img_des; 28         $this->image_type = $image_info[2]; 29         $this->compression = $compression; 30         $this->permissions = $permissions; 31   32         if ($this->image_type == IMAGETYPE_JPEG) { 33             $this->image = ImageCreateFromJPEG($img_src); 34         } elseif ($this->image_type == IMAGETYPE_GIF) { 35             $this->image = ImageCreateFromGIF($img_src); 36         } elseif ($this->image_type == IMAGETYPE_PNG) { 37             $this->image = ImageCreateFromPNG($img_src); 38         } 39     } 40   41     /** 42      * 保存图片 43      */ 44     function save() 45     { 46         if ($this->image_type == IMAGETYPE_JPEG) { 47             imagejpeg($this->image, $this->img_des, $this->compression); 48         } elseif ($this->image_type == IMAGETYPE_GIF) { 49             imagegif($this->image, $this->img_des); 50         } elseif ($this->image_type == IMAGETYPE_PNG) { 51             imagepng($this->image, $this->img_des); 52         } 53   54         if ($this->permissions != null) { 55             chmod($this->image, $this->compression); 56         } 57     } 58   59     /** 60      * 做为图片流直接输出 61      */ 62     function output() 63     { 64         if ($this->image_type == IMAGETYPE_JPEG) { 65             header(‘Content-Type: image/jpg‘); 66             imagejpeg($this->image); 67         } elseif ($this->image_type == IMAGETYPE_GIF) { 68             header(‘Content-Type: image/gif‘); 69             imagegif($this->image); 70         } elseif ($this->image_type == IMAGETYPE_PNG) { 71             header(‘Content-Type: image/png‘); 72             imagepng($this->image); 73         } 74     } 75   76     /** 77      * 获取图片宽度 78      * @return int 图片宽度 79      */ 80     function getWidth() 81     { 82         return imagesx($this->image); 83     } 84   85     /* 86      * 获取图片高度 87      * @return int 图片高度 88      */ 89     function getHeight() 90     { 91         return imagesy($this->image); 92     } 93   94     /** 95      * 按照固定高度缩放图片 96      * @param $height 需要改变大小的高度 97      */ 98     function resizeToHeight($height) 99     {100         $ratio = $height / $this->getHeight();101         $width = $this->getWidth() * $ratio;102         $this->resize($width, $height);103     }104  105     /**106      * 按照固定宽度缩放图片107      * @param $width 指定宽度108      */109     function resizeToWidth($width)110     {111         $ratio = $width / $this->getWidth();112         $height = $this->getheight() * $ratio;113         $this->resize($width, $height);114     }115  116     /**117      * 等比缩放图片118      * @param int $scale 缩放比例119      */120     function scale($scale)121     {122         $width = $this->getWidth() * $scale / 100;123         $height = $this->getheight() * $scale / 100;124         $this->resize($width, $height);125     }126  127  128     /**129      * 指定宽度和高度缩放图片130      * @param int $width  缩放宽度131      * @param int $height 缩放高度132      * @return 缩放后图片对象133      */134     function resize($width, $height)135     {136         $new_image = imagecreatetruecolor($width, $height);137  138         if ($this->image_type == IMAGETYPE_GIF || $this->image_type == IMAGETYPE_PNG) {139             $current_transparent = imagecolortransparent($this->image);140             if ($current_transparent != -1) {141                 $transparent_color = imagecolorsforindex($this->image, $current_transparent);142                 $current_transparent = imagecolorallocate($new_image, $transparent_color[‘red‘], $transparent_color[‘green‘], $transparent_color[‘blue‘]);143                 imagefill($new_image, 0, 0, $current_transparent);144                 imagecolortransparent($new_image, $current_transparent);145             } elseif ($this->image_type == IMAGETYPE_PNG) {146                 imagealphablending($new_image, false);147                 $color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);148                 imagefill($new_image, 0, 0, $color);149                 imagesavealpha($new_image, true);150             }151         }152  153         imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());154         $this->image = $new_image;155     }156 }157  158 ?>

1 $image = new ImageResize($tmp_image_name, NULL, 100);2 $image->output();