php图片缩放实现方法_PHP教程-php教程-PHP中文网

php图片缩放实现方法_PHP教程

php中文网

发布： 2016-07-13 10:24:58

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php基础练习--图片缩放：

复制代码代码如下:

    /**
    * 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;
        }