代碼點火器圖像縮略圖自定義大小

Question

我是PHP的新手，我需要此功能的幫助，我想使用Width：300px和height：auto（長寬比）來制作它，並且我希望它不裁剪圖像，而只是在此處調整大小

if ( ! function_exists('create_rect_thumb'))
{

function create_rect_thumb($img,$dest,$ratio=3)
{

    $seg = explode('.',$img);   //explde the source to get the image extension
    $thumbType    = 'jpg';      //generated thumb will be of type jpg
    $thumbPath    = $dest;  //destination path of the thumb -- original image name will be appended
    $thumbQuality = 90;             //quality of the thumbnail (in percent)

    //chech the image type and create image accordingly
    if($seg[2]=='jpg' || $seg[2]=='JPG' || $seg[2]=='jpeg')
    {
        if (!$full = imagecreatefromjpeg($img)) {
            return 'error';
        }
    }
    else if($seg[2]=='png')
    {
        if (!$full = imagecreatefrompng($img)) {
            return 'error';
        }           
    }
    else if($seg[2]=='gif')
    {
        if (!$full = imagecreatefromgif($img)) {
            return 'error';
        }           
    }

    $width  = imagesx($full);
    $height = imagesy($full);

    /*wourk out the thumbnail size*/
    $resizedHeight  = min($width*$ratio/8,$height);
    $resizedWidth   = $width;

    /* work out starting point */
    $thumbx = 0;    // x always starts at zero -- the thumbnail gets the same width as the source image
    $extra_height = $height - $resizedHeight;
    $thumby = floor(($extra_height) / 2);

    /* create the small smaller version, then crop it centrally to create the thumbnail */
    $resized  = imagecreatetruecolor($resizedWidth, $resizedHeight);
    imagecopy($resized, $full,0,0,$thumbx,$thumby,$resizedWidth,$resizedHeight);

    $name = name_from_url($img);

    imagejpeg($resized, $thumbPath.str_replace('_large.jpg', '_thumb.jpg', $name), $thumbQuality);
}

}

現在，它正在創建全幅為原始圖像，半高為原始圖像的圖像橫幅

Answer 1

使用ci圖像處理類

http://www.codeigniter.com/user_guide/libraries/image_lib.html

您可以使用此代碼

$ this-> load-> library（'image_lib'）;

$ config ['image_library'] ='gd2';

$ config ['source_image'] ='/path/to/image/mypic.jpg';

$ config ['create_thumb'] = TRUE;

$ config ['maintain_ratio'] = TRUE;

$ config ['width'] = 300;

$ config ['height'] = 50;

$ this-> load-> library（'image_lib'，$ config）;

$ this-> image_lib-> resize（）;

如果使用ci文件上傳類？ 然后您可以使用$ this-> upload-> data（'upload_path'）;獲取圖像的完整路徑； 此函數存儲圖像並將其放置在$ config ['source_image']中

例如：$ config ['source_image'] = $ this-> upload-> data（'upload_path'）;