后端开发|php教程
img,height,width,protected,handle
后端开发-php教程
PHP创建缩略图造成图片质量低下的完美解决方法
/**?[emailprotected]?[emailprotected]$img_name???图片路径?[emailprotected]$max_width??略图最大宽度?[emailprotected]$max_height?略图最大高度?[emailprotected]$suffix?略图后缀(如”img_x.jpg”代表小图,”img_m.jpg”代表中图,”img_l.jpg”代表大图)?[emailprotected]?*/??function?thum($img_name,$max_width,$max_height,$suffix){??????????$img_infos=getimagesize($img_name);??????????$img_height=$img_infos[0];//图片高??????????$img_width=$img_infos[1];//图片宽??????????$img_extension=”;//图片后缀名??????????switch($img_infos[2]){??????????????case?1:??????????????????$img_extension=’gif’;??????????????????break;??????????????case?2:??????????????????$img_extension=’jpeg’;??????????????????break;???????????case?3:??????????????????$img_extension=’png’;??????????????????break;??????????????default:??????????????????$img_extension=’jpeg’;??????????????????break;??????????????}??????????$new_img_size=get_thum_size($img_width,$img_height,$max_width,$max_height);//新的图片尺寸??????????????????????????????//print_r($new_img_size);??????????//die(‘test’);??????????$img_func=”;//函数名称??????????$img_handle=”;//图片句柄??????????$thum_handle=”;//略图图片句柄??????????switch($img_extension){??????????????case?’jpg’:??????????????????$img_handle=imagecreatefromjpeg($img_name);??????????????????$img_func=’imagejpeg’;??????????????????break;??????????????case?’jpeg’:??????????????????$img_handle=imagecreatefromjpeg($img_name);??????????????????$img_func=’imagejpeg’;?????????????????break;??????????????case?’png’:??????????????????$img_handle=imagecreatefrompng($img_name);??????????????????$img_func=’imagepng’;??????????????????break;??????????????case?’gif’:??????????????????$img_handle=imagecreatefromgif($img_name);??????????????????$img_func=’imagegif’;??????????????????break;??????????????default:??????????????????$img_handle=imagecreatefromjpeg($img_name);??????????????????$img_func=’imagejpeg’;?????????????????break;??????????????}??????????/****/????????????$quality=100;//图片质量??????????if($img_func===’imagepng’?&&?(str_replace(‘.’,?”,?PHP_VERSION)>=?512)){//针对php版本大于5.12参数变化后的处理情况??????????????$quality=9;??????????????}???????????/****/??????????$thum_handle=imagecreatetruecolor($new_img_size[‘height’],$new_img_size[‘width’]);??????????if(function_exists(‘imagecopyresampled’)){??????????????imagecopyresampled($thum_handle,$img_handle,?0,?0,?0,?0,$new_img_size[‘height’],$new_img_size[‘width’],$img_height,$img_width);??????????????}else{??????????????????imagecopyresized($thum_handle,$img_handle,?0,?0,?0,?0,$new_img_size[‘height’],$new_img_size[‘width’],$img_height,$img_width);??????????????}??????????call_user_func_array($img_func,array($thum_handle,get_thum_name($img_name,$suffix),$quality));??????????imagedestroy($thum_handle);//清除句柄??????????imagedestroy($img_handle);//清除句柄??????}????/**?[emailprotected]_thum_size?获得缩略图的尺寸?[emailprotected]$width??图片宽?[emailprotected]$height?图片高?[emailprotected]$max_width?最大宽度?[emailprotected]$maxHeight?最大高度?[emailprotected]$size;?*/??function?get_thum_size($width,$height,$max_width,$max_height){??????$now_width=$width;//现在的宽度??????$now_height=$height;//现在的高度??????$size=
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