File: /web/data/www.tbbprovision.com/lib/class/img.class.php
<?php
/**
* 图片缩略图生成类
* Created by PhpStorm.
* User: Administrator
* Date: 2017/6/29
* Time: 9:56
*/
class img{
public static function resize($source_img, $dest_width=400, $dest_height=400, $dest_img=''){ //源图片必须相对于网站根目录
if(!is_file(APP_PATH.$source_img)){return '';}
$ext_name=file::get_ext_name($source_img);
$dest_img=='' && $dest_img=$source_img.".{$dest_width}x{$dest_height}.{$ext_name}";
if($ext_name=='jpg' || $ext_name=='jpeg'){
$im=imagecreatefromjpeg(APP_PATH.$source_img);
}elseif($ext_name=='png'){
$im=imagecreatefrompng(APP_PATH.$source_img);
}elseif($ext_name=='gif'){
$im=imagecreatefromgif(APP_PATH.$source_img);
}else{
@copy(APP_PATH.$source_img, APP_PATH.$dest_img);
@chmod(APP_PATH.$dest_img, 0775);
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(1){
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){
$ratio=min($width_ratio, $height_ratio);
}elseif($resize_width){
$ratio=$width_ratio;
}elseif($resize_height){
$ratio=$height_ratio;
}
$new_width=ceil($source_width*$ratio); //优先保持所定义的宽度
$new_height=floor($source_height*$ratio);
$new_width=$resize_width=$dest_width;
$new_height=$resize_height=$dest_height;
$new_im=@imagecreatetruecolor($new_width, $new_height);
if($ext_name=='png' || $ext_name=='gif'){
@imagealphablending($new_im, false);
@imagesavealpha($new_im, true);
}
//新图比例
$new_ratio = $new_width/$new_height;
//源图比例
$source_ratio = $source_width/$source_height;
//源图比目标图的比例要宽
if($source_ratio > $new_ratio){
$resize_width = $source_height*$new_ratio;
$resize_height = $source_height;
//源图比目标图的比例要高
}else{
$resize_width = $source_width;
$resize_height = $source_width/$new_ratio;
}
@imagecopyresampled($new_im, $im, 0, 0, 0, 0, $new_width, $new_height, $resize_width, $resize_height);
if($ext_name=='jpg' || $ext_name=='jpeg'){
@imagejpeg($new_im, APP_PATH.$dest_img, 100);
}elseif($ext_name=='png'){
@imagepng($new_im, APP_PATH.$dest_img);
}else{
$bgcolor=imagecolorallocate($new_im, 0, 0, 0);
$bgcolor=imagecolortransparent($new_im, $bgcolor);
$bgcolor=imagecolorallocatealpha($new_im, 0, 0, 0, 127);
imagefill($new_im, 0, 0, $bgcolor);
imagegif($new_im, APP_PATH.$dest_img);
}
@imagedestroy($new_im);
}else{
@copy(APP_PATH.$source_img, APP_PATH.$dest_img);
}
imagedestroy($im);
@chmod(APP_PATH.$dest_img, 0775);
return $dest_img; //返回调整后的文件名
}
public static function img_width_height($show_img_width, $show_img_height, $picpath, $echo_width_height=1){ //按比例缩小图片
if(is_file(APP_PATH.$picpath)){
$img_info=getimagesize(APP_PATH.$picpath);
$width=$img_info[0];
$height=$img_info[1];
if($width>$show_img_width){
$ratio=$width/$show_img_width;
$width=floor($width/$ratio);
$height=floor($height/$ratio);
}
if($height>$show_img_height){
$ratio=$height/$show_img_height;
$width=floor($width/$ratio);
$height=floor($height/$ratio);
}
if($echo_width_height==1){
return "width='$width' height='$height'";
}else{
return array($width, $height);
}
}
return '';
}
public static function img_add_watermark($source_img){ //图片添加水印
$config_row=str::str_code(db::get_all('config', "GroupId='global'"));
$cfg=array();
foreach($config_row as $v){
$cfg[$v['Variable']]=$v['Value'];
}
$watermark=array(
'allowed_width' => 100, //源图片宽度小于此值不添加水印直接返回
'allowed_height' => 100, //源图片高度小于此值不添加水印直接返回
'padding_border' => 10, //水印离图片边缘的像素数
'img' => $cfg['WatermarkPath'], //图片水印路径
'img_alpha' => $cfg['Alpha'], //图片水印透明度（PNG水印时此参数无效）
'position' => $cfg['WaterPosition'], //水印的位置印
);
($watermark['position']<1 || $watermark['position']>9) && $watermark['position']=0;
if(!is_file(APP_PATH.$source_img) || (!is_file(APP_PATH.$watermark['img']) && $watermark['type']==0)){ //源文件不存在则直接返回
return $source_img; //返回源文件路径
}
$ext_name=file::get_ext_name($source_img);
if($ext_name=='jpg' || $ext_name=='jpeg'){
$source_im=imagecreatefromjpeg(APP_PATH.$source_img);
}elseif($ext_name=='png'){
$source_im=imagecreatefrompng(APP_PATH.$source_img);
}elseif($ext_name=='gif'){
$source_im=imagecreatefromgif(APP_PATH.$source_img);
}else{
return $source_img; //返回源文件路径
}
$source_width=imagesx($source_im); //源图片宽
$source_height=imagesy($source_im); //源图片高
if($source_width<$watermark['allowed_width'] || $source_height<$watermark['allowed_height']){
return $source_img; //返回源文件路径
}
$watermark_img_ext_name=file::get_ext_name($watermark['img']);
if($watermark_img_ext_name=='jpg' || $watermark_img_ext_name=='jpeg'){
$watermark_im=imagecreatefromjpeg(APP_PATH.$watermark['img']);
}elseif($watermark_img_ext_name=='png'){
$watermark_im=imagecreatefrompng(APP_PATH.$watermark['img']);
}elseif($watermark_img_ext_name=='gif'){
$watermark_im=imagecreatefromgif(APP_PATH.$watermark['img']);
}else{
return $source_img; //返回源文件路径
}
$watermark_width=imagesx($watermark_im); //水印图片宽
$watermark_height=imagesy($watermark_im); //水印图片高
switch($watermark['position']){ //水印位置
case 1: //1为顶端居左
$posX=$watermark['padding_border'];
$posY=$watermark['padding_border'];
break;
case 2: //2为顶端居中
$posX=($source_width-$watermark_width)/2;
$posY=$watermark['padding_border'];
break;
case 3: //3为顶端居右
$posX=$source_width-$watermark_width-$watermark['padding_border'];
$posY=$watermark['padding_border'];
break;
case 4: //4为中部居左
$posX=$watermark['padding_border'];
$posY=($source_height-$watermark_height)/2;
break;
case 5: //5为中部居中
$posX=($source_width-$watermark_width)/2;
$posY=($source_height-$watermark_height)/2;
break;
case 6: //6为中部居右
$posX=$source_width-$watermark_width-$watermark['padding_border'];
$posY=($source_height-$watermark_height)/2;
break;
case 7: //7为底端居左
$posX=$watermark['padding_border'];
$posY=$source_height-$watermark_height-$watermark['padding_border'];
break;
case 8: //8为底端居中
$posX=($source_width-$watermark_width)/2;
$posY=$source_height-$watermark_height-$watermark['padding_border'];
break;
case 9: //9为底端居右
$posX=$source_width-$watermark_width-$watermark['padding_border'];
$posY=$source_height-$watermark_height-$watermark['padding_border'];
break;
default: //随机
$posX=mt_rand($watermark['padding_border'], $source_width-$watermark_width-$watermark['padding_border']);
$posY=mt_rand($watermark['padding_border'], $source_height-$watermark_height-$watermark['padding_border']);
}
if($ext_name=='png' || $ext_name=='gif'){
imagealphablending($source_im, false);
imagesavealpha($source_im, true);
}
if($watermark_img_ext_name=='png'){
imagecopyresampled($source_im, $watermark_im, $posX, $posY, 0, 0, $watermark_width, $watermark_height, $watermark_width, $watermark_height);
}else{
imagecopymerge($source_im, $watermark_im, $posX, $posY, 0, 0, $watermark_width, $watermark_height, $watermark['img_alpha']); //拷贝水印到目标文件
}
imagedestroy($watermark_im);
if($ext_name=='jpg' || $ext_name=='jpeg'){
imagejpeg($source_im, APP_PATH.$source_img, 100);
}elseif($ext_name=='png'){
imagepng($source_im, APP_PATH.$source_img);
}else{
imagegif($source_im, APP_PATH.$source_img);
}
imagedestroy($source_im);
return $source_img; //返回源文件路径
}
}