PHP相关系列 - PHP 图片处理类

/********************************************************************************* * InitPHP 2.0 国产PHP开发框架  扩展类库-图片处理类 *------------------------------------------------------------------------------- * 版权所有: CopyRight By initphp.com * 您可以自由使用该源码，但是在使用过程中，请保留作者信息。尊重他人劳动成果就是尊重自己 *------------------------------------------------------------------------------- * $Author:zhuli * $Dtime:2011-10-09 ***********************************************************************************/class imageInit {/** * 图像处理-缩略图处理 * @param string $source 被缩略的图 * @param stirng $newname缩略后的新图  * @param int    $width  宽度 * @param int    $height 高度 * @param bool   $isauto 是否根据原始图片的长宽比自动缩略，true-是的|false-不是 */public function make_thumb($source, $newname, $width = 100, $height = 100, $isauto = true) {if (!file_exists($source)) return false;$image_info = $this->get_img_info($source); //获取原始图片信息        if ($image_info['type'] == 'bmp') return false;list($imagecreate, $imagecopyre) = $this->get_image_create($image_info['type']); //获取创建图像和拷贝图像的函数if (empty($image_info) || !$imagecreate) return false;/* 画布和原始图创建 */$thumb = $imagecreate($width, $height); //创建一个图片-画布$imagecreatefrom = 'imagecreatefrom' .$image_info['type']; $source = $imagecreatefrom($source);if(function_exists('ImageColorAllocate') && function_exists('ImageColorTransparent')){$black = ImageColorAllocate($thumb,0,0,0); //着色$bgTransparent = ImageColorTransparent($thumb,$black);}/* 是否根据原始图片的长宽比自动缩略 */$src_x = $src_y = 0;if ($isauto == true) {if ($image_info['width'] < $image_info['height']) {$src_y = round(($image_info['height'] - $image_info['width']) / 2);$image_info['height'] = $image_info['width'];} else {$src_x = round(($image_info['width'] - $image_info['height']) / 2);$image_info['width'] = $image_info['height'];}}/* 拷贝和创建图像 */$imagecopyre($thumb, $source, 0, 0, $src_x, $src_y, $width, $height, $image_info['width'], $image_info['height']); //拷贝$result = $this->make($image_info['type'], $thumb, $newname);if (!$result) return array(); //缩略图创建失败imagedestroy($thumb);return array($width, $height);}/** * 图像处理-图片水印 * @param string $source_path   需要生成水印的图片 * @param string $water_path    水印图片位置 * @param string $position      显示的位置：0 随机|1 左上|2 中上|3 右上 |4 左下|5中下|6右下|其它中间 * @param string $pct           水印图片透明度 * @param string $quality       生成图片的品质，0-100，值越大品质越高 * @return bool */public function water_mark($source_path, $water_path, $postion, $pct=100, $quality=100) {if (!file_exists($source_path) || !file_exists($water_path)) return false;/* 图片信息 */$source_info = $this->get_img_info($source_path);$water_info  = $this->get_img_info($water_path);if ($source_info['type'] == 'bmp' || $water_info['type'] == 'bmp') return false;if ($source_info['type']) {$imagecreatefrom = 'imagecreatefrom' .$source_info['type']; $source = $imagecreatefrom($source_path);}if ($water_info['type']) {$imagecreatefrom = 'imagecreatefrom' .$water_info['type']; $water = $imagecreatefrom($water_path);}/* 处理 */imagealphablending($source, true); //混色模式list($x, $y) = $this->get_water_postion($postion, $source_info['width'], $source_info['height'], $water_info['width'], $water_info['height']);if ($water_info['type'] == 'png') { $temp = imagecreatetruecolor($source_info['width'], $source_info['height']); //创建着色板imagecopy($temp, $source, 0, 0, 0, 0, $source_info['width'], $source_info['height']); //将源图拷贝进着色版imagecopy($temp, $water, $x, $y, 0, 0, $water_info['width'], $water_info['height']); //将水印拷贝进着色办$source = $temp;} else { imagecopymerge($source, $water, $x, $y, 0,0, $water_info['width'], $water_info['height'], $pct); //合并}$ext = strtolower(substr(strrchr(basename($source_path), '.'), 1));$shource_dir = dirname($source_path); //修改水印BUG$source_path = $shource_dir . '/' . basename($source_path, '.' . $ext);$this->make($source_info['type'], $source, $source_path, $quality);imagedestroy($source);imagedestroy($water);return true;}/** * 图像处理-获取水印位置 * @param int $position      水印位置 * @param int $source_width 原始图片的宽 * @param int $source_height原始图片的高 * @param int $water_width  水印图片的宽 * @param int $water_height 水印图片的高 * @return array(宽，高) */private function get_water_postion($position, $source_width, $source_height, $water_width, $water_height) {if ($position == 0) {$x = rand(0, ($source_width - $water_width));$y = rand(0, ($source_height - $water_height));} elseif ($position == 1) {$x = 5;$y = 5;} elseif ($position == 2) {$x = ($source_width - $water_width) / 2;$y = 5;} elseif ($position == 3) {$x = $source_width - $water_width - 5;$y = 5;} elseif ($position == 4) {$x = 5;$y = $source_height - $water_height - 5;} elseif ($position == 5) {$x = ($source_width - $water_width) / 2;$y = $source_height - $water_height - 5;} elseif ($position == 6) {$x = $source_width - $water_width - 5;$y = $source_height - $water_height - 5;} else {$x = ($source_width - $water_width) / 2;$y = ($source_height - $water_height) / 2;}return array($x, $y);}/* * 图像处理-生成图片 * @param string $type     图片类型 * @param string $image    图片资源 * @param string $filename 图片文件名 * @param int    $quality  图片质量,对jpeg有效 * @return bool */private function make($type, $image, $filename, $quality = '75') {$file_type = ($type !== 'jpeg') ? $type : 'jpg';$filename = $filename . '.' . $file_type;$this->createFolder(dirname($filename)); //创建目录 $makeimage = 'image' . $type;  if (!function_exists($makeimage)) {return false;}if ($type == 'jpeg') {$makeimage($image, $filename, $quality);} else {$makeimage($image, $filename);}return true;}/** * 图像处理-获取图像信息 * @param string $source 源文件图片 * @return array(图片的宽、高、类型) */private function get_img_info($source) {$imginfo = array();$ext = strtolower(substr(strrchr($source, '.'), 1)); //获取图片类型$image_type = array(1=>'gif', 2=>'jpeg', 3=>'png', 6=>'bmp');if (function_exists('read_exif_data') && in_array($ext, array('jpg','jpeg','jpe','jfif'))) { //jpeg情况$temp = @read_exif_data($source);$imginfo['width']  = $temp['COMPUTED']['Width'];$imginfo['height'] = $temp['COMPUTED']['Height'];$imginfo['type'] = 2;unset($temp);}if (empty($imginfo)) { //png,gif,bmplist($imginfo['width'], $imginfo['height'], $imginfo['type']) = @getimagesize($source);}$imginfo['type'] = $image_type[$imginfo['type']];return $imginfo;}/** * 图像处理-返回图像创建和图像 * 说明：gif和jpeg等函数的图像创建函数不一样 * @param string $imagetype 图像类型-gif、jpeg、png、bmp * @return array(图像创建函数， 图像拷贝函数)  */private function get_image_create($imagetype) {if ($imagetype != 'gif' && function_exists('imagecreatetruecolor') && function_exists('imagecopyresampled')) {return array('imagecreatetruecolor','imagecopyresampled');} elseif (function_exists('imagecreate') && function_exists('imagecopyresized')) {return array('imagecreate','imagecopyresized');} else {return array();}}/** * 图像处理-创建目录 如果目录存在，则不创建，不存在则创建 static * @param $path 路径 * @return  */public static function createFolder($path) {if (!is_dir($path)) {imageInit::createFolder(dirname($path));@mkdir($path);@chmod($path, 0777);@fclose(@fopen($path . '/index.html', 'w'));@chmod($path . '/index.html', 0777);}}}