其他回答

• 直接给个函数你吧.$site_root_path为网站的绝对路径.$source_img为源图片,$dest_img为目标图片functionimg_resize$source_img,$dest_img='''',$dest_width=200,$dest_height=150{//源图片必须相对于网站根目录global$site_root_path;if!is_file$site_root_path.$source_img{return'''';}if$dest_img==''''{$dest_img=dirname$source_img.''/small_''.basename$source_img;}$source_img_info=getimagesize$site_root_path.$source_img;$source_img_mime=$source_img_info;//图片MIME类型，PHPversion>=4.3if$source_img_mime==''image/jpeg''{$im=imagecreatefromjpeg$site_root_path.$source_img;}elseif$source_img_mime==''image/x-png''{$im=imagecreatefrompng$site_root_path.$source_img;}elseif$source_img_mime==''image/gif''{$im=imagecreatefromgif$site_root_path.$source_img;}else{@copy$site_root_path.$source_img,$site_root_path.$dest_img;@chmod$site_root_path.$dest_img,0777;return$return_img;//返回调整后的文件}$source_width=imagesx$im;//源图片宽$source_height=imagesy$im;//源图片高if$source_width>$dest_width||$source_height>$dest_height{if$source_width>=$dest_width{$width_ratio=$dest_width/$source_width;$resize_width=true;}if$source_height>=$dest_height{$height_ratio=$dest_height/$source_height;$resize_height=true;}if$resize_width&&$resize_height{$ratio=$width_ratio<$height_ratio?$width_ratio:$height_ratio;}elseif$resize_width{$ratio=$width_ratio;}elseif$resize_height{$ratio=$height_ratio;}$new_width=$source_width*$ratio;$new_height=$source_height*$ratio;iffunction_exists''imagecopyresampled''{$new_im=imagecreatetruecolor$new_width,$new_height;imagecopyresampled$new_im,$im,0,0,0,0,$new_width,$new_height,$source_width,$source_height;}else{$new_im=imagecreate$new_width,$new_height;imagecopyresized$new_im,$im,0,0,0,0,$new_width,$new_height,$source_width,$source_height;}imagejpeg$new_im,$site_root_path.$dest_img,100;imagedestroy$new_im;}else{imagejpeg$im,$site_root_path.$dest_img,100;}imagedestroy$im;@chmod$site_root_path.$dest_img,0777;return$dest_img;//返回调整后的文件名。
  连丽钦2019-11-03 18:02:01