php圖片縮放實現方法_PHP教程

來源:互聯網
上載者:User
php基礎練習--圖片縮放:
複製代碼 代碼如下:
/**
* image zoom.
*/
function imageZoom($filename, $w, $h) {
/* Arguments meaning */
/* $filename: the source of the name */
/* $w: you want get the image's width */
/* $h: you want get the imgage's height */
$arr = getimagesize($filename);
$src_w = $arr[0];
$src_h = $arr[1];
$src_t = $arr[2];
/*1 = GIF,2 = JPG,3 = PNG,4 = SWF,5 = PSD,6 = BMP,7 = TIFF(intel byte order),
= TIFF(motorola byte order),9 = JPC,10 = JP2,11 = JPX,12 = JB2,13 = SWC,
= IFF,15 = WBMP,16 = XBM*/
$src_m = $arr['mime'];

$src_img = imagecreatefromjpeg($filename);

if (($w / $src_w) >($h / $src_h)) {
$bili = $h / $src_h;
} else {
$bili = $w / $src_h;
}
$dst_w = $src_w * $bili;
$dst_h = $src_h * $bili;
$dst_img = imagecreatetruecolor($dst_w, $dst_h);

imagecopyresampled($dst_img, $src_img, 0, 0, 0, 0, $dst_w, $dst_h, $src_w, $src_h);

header("content-type:{$src_m}");

switch ($src_t) {
case 1:
$imgout = "imagegif";
break;
case 2:
$imgout = "imagejpeg";
break;
case 3:
$imgout = "imagepng";
break;
default:
echo "The type was wrong!";
break;
}

$dst_filename = "s_".$filename;
$imgout($dst_img, $dst_filename);

imagedestroy($dst_img);
}
$filename = 'gg.jpg';
imageZoom($filename, 100, 200);

核心:<1>注意縮放比例如何得到,雖然這樣得到的圖片可能會與預想的有點差別,但是最起碼保證了縮放比例。

   <2>類型的控制。

http://www.bkjia.com/PHPjc/825280.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/825280.htmlTechArticlephp基礎練習--圖片縮放: 複製代碼 代碼如下: ?php /** * image zoom. */ function imageZoom($filename, $w, $h) { /* Arguments meaning */ /* $filename: the source of th...

  • 聯繫我們

    該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

    如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.