按比例生成缩略图文件及显示缩略图

2024-05-04 22:59:18

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来源：转载

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<?php

    function createthumbnail($path,$newfilename,$width=100,$height=100)
    {
        @$s_img = getimagesize($path);
        @$type = $s_img[2];

        switch($type)
        {
            case 1 : @$im = imagecreatefromgif($path);break;
            case 2 : @$im = imagecreatefromjpeg($path); break;
            case 3 : @$im = imagecreatefrompng($path);break;
            default: $im = false;
            break;
        }

        @$s_width = imagesx($im);
        @$s_height = imagesy($im);

        $sizexy = getscaleimage($path,$width,$height);
        $width = $sizexy[0];
        $height = $sizexy[1];

        if($im)
        {
            $im2 = imagecreatetruecolor($width,$height);
            imagecopyresized ($im2,$im,0,0,0,0,$width,$height,$s_width,$s_height);
            imagejpeg($im2,$newfilename);
        }
        return false;
    }

    function getscaleimage($image,$perfectwidth,$perfectheight)
    {
        if (realpath($image) != false)
        {
            $sizearray = getimagesize($image);
            $sizex     = $sizearray[ 0 ] ;
            $sizey     = $sizearray[ 1 ] ;

            if ($perfectwidth!=0 && $perfectheight==0)
            {
                if ($sizex>$perfectwidth)
                {
                    $scale = $sizex/$sizey ;
                    $sizex = $perfectwidth;
                    $sizey = floor($sizex/$scale);
                }
            }

            if ($perfectheight != 0 && $perfectwidth == 0)
            {
                if ($sizey > $perfectheight)
                {
                    $scale = $sizey / $sizex ;
                    $sizey = $perfectheight;
                    $sizex = floor($sizey / $scale);
                }
            }

            if ($perfectheight != 0 && $perfectwidth != 0)
            {
                $sizex = $perfectwidth;
                $sizey = $perfectheight;
            }

            $tmp[] = $sizex;
            $tmp[] = $sizey;
        }
        else
        {
            $tmp[] = 0;
        }
        return $tmp;
    }

    $tm = getscaleimage("http://www.pushad.com/info/100_3353.jpg",0,0);
    echo "<img src="http://www.pushad.com/info/100_3353.jpg" width='".$tm[0]."' height='".$tm[1]."' />";
    foreach ($tm as $v)
    {
        echo $v."<br>";
    }