chaoyu/app/service/Image.php

<?php
namespace app\service;

use think\Image as TImage;
use app\model\System;

class Image extends File
{
    /**
     * 对图片进行重置大小，并对宽度大于max宽度的等比缩放为宽度为1920
     * milo
     * 2019-10-24修改
     */
    public static function resize($src)
    {
        $max = 1920;
        $realPath = app()->getRootPath() . 'public/' . ltrim($src,'/');
        if(is_file($realPath)){
            $img = TImage::open($realPath);
            list($img_w,$img_h) = $img->size();
            if($max > 0 && $img_w > $max){
                $img->thumb($max, $max * ($img_h / $img_w))->save($realPath);
            }
        }
    }

    /**
     * 添加水印
     * milo
     * 2018-01-17
     */
    public static function mark($src)
    {
        $rootPath = app()->getRootPath();
        if(!empty($src)){
            $system = System::getSystem();
            $realPath = $rootPath . 'public/' . ltrim($src, '/');
            if(is_file($realPath)){
                if($system['is_mark']){
                    $mark = $rootPath . ltrim($system['mark_img'], '/');
                    if(is_file($mark)){
                        $mark_position = $system['mark_position']??5;
                        $mark_opacity = $system['mark_opacity']??50;
                        $img = TImage::Open($realPath);
                        $img->water($mark,$mark_position,$mark_opacity)->save($realPath);
                    }
                }
            }
        }
    }
    
    //获取水印位置键值对
    public static function getMarkPosition()
    {
        return [
            "1" => '上左',
            "2" => '上中',
            "3" => '上右',
            "4" => '中左',
            "5" => '正中',
            "6" => '中右',
            "7" => '下左',
            "8" => '下中',
            "9" => '下右'
        ];
    }

    /**
     * 删除图片
     * milo
     * 2018-01-15
     */
    public static function delImg($src)
    {
        if(!empty(trim($src))){
            $realPath = app()->getRootPath() . 'public/' . ltrim($src, '/');
            if (file_exists($realPath)) {
                $info = pathinfo($realPath);
                $source = $info['dirname'] . DIRECTORY_SEPARATOR . $info['filename'] . '*.' . $info['extension'];
                foreach(glob($source) as $filename){
                    if(is_file($filename)){
                        unlink($filename);
                    }
                }
                clearstatcache();// 清除缓存
            }

        }
    }
    /**
     * 获取缩略图
     * milo
     * 2019-10-24修改
     * 避免跨平台出错，目录分隔符全部转换为'/'
     * app()->getRuntimePath() = app()->getRootPath().'runtime/当前应用模块（api）/'
     */
    public static function getThumb($src,$width=0,$height=0,$type = TImage::THUMB_CENTER)
    {
        if(empty($src)){
            return '';
        }
        $rootPath = app()->getRootPath();
        $realPath = $rootPath . 'public/' . ltrim($src, '/');
        $realPath = str_replace('\\', '/', $realPath);
        if(!file_exists($realPath)){
            return '';
        }
        $info = pathinfo($src);
        if($width <= 0 && $height <= 0){    //高宽都小于或等于0，则返回原图片
            return $src;
        }
        $image = TImage::open($realPath);
        list($imageWidth, $imageHeight) = $image->size();
        if($width <= 0){
            $width = floor($height * ($imageWidth / $imageHeight));
        }elseif($height <= 0){
            $height = floor($width * ($imageHeight / $imageWidth));
        }
        if($width >= $imageWidth || $height >= $imageHeight){
            return $src;
        }
        $thumbName = $info['dirname']. DIRECTORY_SEPARATOR .$info['filename'].'_'.$width.'_'.$height.'.'.$info['extension'];
        $realThumbName = $rootPath . 'public/' . ltrim($thumbName, '/');
        $realThumbName = str_replace('\\', '/', $realThumbName);
        if(!file_exists($realThumbName)){
            $image = TImage::open($realPath);
            $image->thumb($width, $height, $type)->save($realThumbName);
        }
        return str_replace('\\', '/', $thumbName);
    }
}