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php图片缩放实现方法

程序员文章站 2023-11-28 20:29:10
php基础练习--图片缩放:复制代码 代码如下:

php基础练习--图片缩放:

复制代码 代码如下:

<?php
    /**
    * 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>注意缩放比例如何得到,虽然这样得到的图片可能会与预想的有点差别,但是最起码保证了缩放比例。

   <2>类型的控制。