agid])) {
            foreach ($g_flag_thread[$flagid] as &$val) {
                flag_thread_filter($val);
            }
            flag_thread_set($flagid, $g_flag_thread[$flagid]);
        }
    }
    return $g_flag_thread[$flagid];
}

// 设置缓存 $key = flagid / $val = flagid下tid数组
function flag_thread_set($key, $val)
{
    global $g_flag_thread;
    FALSE === $g_flag_thread and $g_flag_thread = website_get('flag_thread');
    empty($g_flag_thread) and $g_flag_thread = array();
    $g_flag_thread[$key] = $val;
    return website_set('flag_thread', $g_flag_thread);
}

// 删除flag下tid缓存
function flag_thread_delete_cache($flagid)
{
    global $g_flag_thread;
    FALSE === $g_flag_thread and $g_flag_thread = website_get('flag_thread');
    empty($g_flag_thread) and $g_flag_thread = array();
    if (isset($g_flag_thread[$flagid])) {
        unset($g_flag_thread[$flagid]);
        website_set('flag_thread', $g_flag_thread);
    }
    return TRUE;
}

// Delete by tid / 通过tid删除flag下的主题和对应flagid缓存
function flag_thread_delete_by_tid($tid)
{
    global $g_flag_thread;
    FALSE === $g_flag_thread and $g_flag_thread = website_get('flag_thread');

    if (empty($g_flag_thread)) {
        $g_flag_thread = array();
    } else {

        $thread = well_thread_read_cache($tid);
        $arrlist = flag_thread_find($tid, 1, $thread['flags']);

        $flagarr = $ids = array();
        foreach ($arrlist as $val) {
            $flagarr[] = $val['flagid'];
            $ids[] = $val['id'];

            if (isset($g_flag_thread[$val['flagid']])) unset($g_flag_thread[$val['flagid']]);
        }

        website_set('flag_thread', $g_flag_thread);

        // 主键更新
        flag_update($flagarr, array('count-' => 1));

        // 主键删除
        flag_thread_delete($ids);
    }

    return TRUE;
}

// 主键删除 通过$flagid删除flag下的主题和对应flagid缓存
function flag_thread_delete_by_flagid($flagid)
{
    global $g_flag_thread;

    

    FALSE === $g_flag_thread and $g_flag_thread = website_get('flag_thread');

    

    $read = flag_read_cache($flagid);
    if (empty($read)) return TRUE;

    $arrlist = flag_thread_find_by_flagid($flagid, 1, $read['count']);
    if (empty($arrlist)) return TRUE;

    

    $flagarr = $ids = array();
    $n = 0;
    foreach ($arrlist as $val) {
        ++$n;
        $flagarr[] = $val['flagid'];
        $ids[] = $val['id'];

        if (isset($g_flag_thread[$flagid])) unset($g_flag_thread[$flagid]);
        
    }

    website_set('flag_thread', $g_flag_thread);

    // 主键更新
    flag_update($flagarr, array('count-' => $n));

    

    // 主键删除
    $r = flag_thread_delete($ids);

    
    return $r;
}




?>break;
    }
    $r = array('filesize' => filesize($tmpfile), 'width' => $des_width, 'height' => $des_height);;
    copy($tmpfile, $destfile);
    is_file($tmpfile) && unlink($tmpfile);
    imagedestroy($img_dst);
    return $r;
}

/**
 * 图片裁切
 *
 * @param string $sourcefile 原图片路径(绝对路径/abc.jpg)
 * @param string $destfile 裁切后生成新名称(绝对路径/rename.jpg)
 * @param int $clipx 被裁切图片的X坐标
 * @param int $clipy 被裁切图片的Y坐标
 * @param int $clipwidth 被裁区域的宽度
 * @param int $clipheight 被裁区域的高度
 * image_clip('xxx/x.jpg', 'xxx/newx.jpg', 10, 40, 150, 150)
 */
function well_image_clip($sourcefile, $destfile, $clipx, $clipy, $clipwidth, $clipheight, $getimgsize = '')
{
    global $conf;
    empty($getimgsize) AND $getimgsize = getimagesize($sourcefile);
    if (empty($getimgsize)) {
        return 0;
    } else {
        $imgwidth = $getimgsize[0];
        $imgheight = $getimgsize[1];
        if (0 == $imgwidth || 0 == $imgheight) {
            return 0;
        }
    }

    if (!function_exists('imagecreatefromjpeg')) {
        copy($sourcefile, $destfile);
        return filesize($destfile);
    }
    switch ($getimgsize[2]) {
        case 1 :
            $imgcolor = imagecreatefromgif($sourcefile);
            break;
        case 2 :
            $imgcolor = imagecreatefromjpeg($sourcefile);
            break;
        case 3 :
            $imgcolor = imagecreatefrompng($sourcefile);
            break;
        case 15: // WBMP
            $imgcolor = imagecreatefromwbmp($sourcefile);
            break;
        case 18: // WEBP
            $imgcolor = imagecreatefromwebp($sourcefile);
            break;
    }

    if (!$imgcolor) return 0;

    $img_dst = imagecreatetruecolor($clipwidth, $clipheight);
    imagefill($img_dst, 0, 0, 0xFFFFFF);
    imagecopyresampled($img_dst, $imgcolor, 0, 0, $clipx, $clipy, $imgwidth, $imgheight, $imgwidth, $imgheight);

    $tmppath = isset($conf['tmp_path']) ? $conf['tmp_path'] : ini_get('upload_tmp_dir') . '/';
    '/' == $tmppath AND $tmppath = './tmp/';

    $tmpfile = $tmppath . md5($destfile) . '.tmp';
    imagejpeg($img_dst, $tmpfile, 75);
    $n = filesize($tmpfile);
    copy($tmpfile, $destfile);
    is_file($tmpfile) && unlink($tmpfile);
    return $n;
}

function well_image_ext($filename) {
    return strtolower(substr(strrchr($filename, '.'), 1));
}


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<div class="betaflare-com main"><div class="betaflare-com top-bar"><div class="betaflare-com crumbs"><a href="/">首页</a><a href="/biancheng">编程</a><span>正文内容</span></div><form method="post" class="search-form" action="/operate/search.html" ><button class="mcico mico-search" type="submit"></button><input type="text" class="search-input" name="keyword" placeholder="关键词" /><input type="hidden" name="range" value="1"></form></div><div class="betaflare-com post-wrap"><div class="betaflare-com post-header"><h1 class="post-title">java后端判断图片尺寸（GB,MB,KB形式），图片色彩（黑白照或彩色照片），图片构图（横图竖图方图）</h1><div class="betaflare-com post-meta"><ul class="post-categories"><li><a href="/biancheng">编程</a></li></ul><span>更新时间：2023-12-11</span><span><i class="mcico mico-huo"></i>72</span><div class="betaflare-com tag-wrap post-header-tags"></div></div></div><div class="betaflare-com post-content"><blockquote style="padding: 0px; margin: 0;" class="author_bq"><a href="/user/1.html" title="admin"><div class="betaflare-com video_docimg"><img src="/upload/avatar/000/1.png?1696565124"></div><div class="betaflare-com video_docinfo"><div><span>admin</span><span class="professional">管理员组</span></div><p class="video_hospital">文章数量:1516870</p></div></a></blockquote><p><p>
<h2>java后端判断图片尺寸（GB,MB,KB形式），图片色彩（黑白照或彩色照片），图片构图（横图竖图方图）</h2>
<link rel="stylesheet" href=".css"><link rel="stylesheet" href=".css"><p>1.判断图片尺寸&#xff0c;将字节大小转为GB&#xff0c;MB&#xff0c;KB形式</p> 
<p>参数size--&gt;File类的getsize()可以获取到文件的字节大小。</p> 
<p style="text-align:center;"></p> 
<p>2.判断图片构图&#xff08;横图竖图方图全景图&#xff08;长大于宽的2.5倍为全景图比例&#xff09;&#xff09;</p> 
<p style="text-align:center;"></p> 
<p>3.判断图片色彩&#xff0c;黑白图&#xff08;灰色图片&#xff09;或者彩图</p> 
<p style="text-align:center;"></p> 
<p> </p><p class="tag">
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