<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 流年 <liu21st@gmail.com>
// +----------------------------------------------------------------------
use think\facade\Env;
// 应用公共文件

if (!function_exists('get_middle_str')) {
    /**
     * 获取指定字符串中间内容
     * @param string $str 原字符串
     * @param string $leftStr 左侧
     * @param string $rightStr
     * @return bool|string
     */
    function get_middle_str($str, $leftStr, $rightStr)
    {
        $left  = strpos($str, $leftStr);
        $right = strpos($str, $rightStr, $left);
        if ($left < 0 || $right < $left) {
            return '';
        }
        return substr($str, $left + strlen($leftStr), $right - $left - strlen($leftStr));
    }
}


if (!function_exists('format_size')) {
    /**
     * 格式化文件大小单位
     * @param $size
     * @param string $delimiter
     * @return string
     */
    function format_size($size, $delimiter = '')
    {
        $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
        for ($i = 0; $size >= 1024 && $i < 5; $i++) {
            $size /= 1024;
        }
        return round($size, 2) . $delimiter . $units[$i];
    }
}

if (!function_exists('thumbnail_img')) {
    /**
     * 生成缩略图
     * @param string $status 上传后图片信息
     * @param string $width 宽
     * @param string $heigh 高
     */
    function thumbnail_img($status, $width, $heigh, $folder_name = '')
    {
        $img = Env::get('root_path') . 'public/uploads/attachment/' . $status->getSaveName();
        $image = \think\Image::open($img);
        $slt = substr($img, 0, strlen($img) - 4);
        $image->thumb($width, $heigh, \think\Image::THUMB_CENTER)->save($slt . '_' . $width . '_' . $heigh . '.' . $status->getExtension());
        $img_url = $status->getSaveName();
        $img_slt = '/uploads/' . $folder_name . '/' . substr($img_url, 0, strlen($img_url) - 4) . '_' . $width . '_' . $heigh . '.' . $status->getExtension();
        return $img_slt;
    }
}