$tmp_file = "watermark1.png"; $pin_image = "aaa.jpg";function add_watermark($image, $water_image,$num){	//原图	$size = getimagesize($image); 	switch($size['mime']){  		case 'image/gif':			$dst_image = imagecreatefromgif($image);  			break;  		case 'image/jpeg':			$dst_image = imagecreatefromjpeg($image);  			break;  		case 'image/png':			$dst_image = imagecreatefrompng($image);  			break;	}	$dst_x = imagesx($dst_image); //原图宽	$dst_y = imagesy($dst_image); //原图高	//水印图	$size = getimagesize($water_image); 	switch($size['mime']){  		case 'image/gif':			$src_im = imagecreatefromgif($water_image);  			break;  		case 'image/jpeg':			$src_im = imagecreatefromjpeg($water_image);  			break;  		case 'image/png':			$src_im = imagecreatefrompng($water_image);			break;	}	$src_x = imagesx($src_im); //水印宽	$src_y = imagesy($src_im); //水印高	//创建一个画布，重采样拷贝部分图像并调整大小	$new_image = imagecreatetruecolor($dst_x,$dst_y); 	imagecopyresampled($new_image, $dst_image, 0, 0, 0, 0, $dst_x, $dst_y, $dst_x, $dst_y); 	//原图和水印合成	$dst_x = ($dst_x - $src_x) / 2;	$dst_y = ($dst_y - $src_y) / 2;	imagecopy($new_image, $src_im, $dst_x, $dst_y, 0, 0, $src_x, $src_y); 	//imagejpeg($new_image, $image);	imagejpeg($new_image, 'watermake_'.$num.jpg);	return 'watermake_'.$num.jpg;}