如何制作不同尺寸/大小的单幅图像

Question

实际上,我想要的是,当我上传1张图像时,原始图像将被存储upload/og/.但我也想在不同的大小,这种形象一样1366x768,1280*600,768x1024等...不仅这些尺寸,它的形象会配合比.

我有一个代码,它是图像转换到大拇指比,这个工作max-width=300和max-height=600.

define ("MAX_SIZE","100");
define ("WIDTH","300");
define ("HEIGHT","600");
function make_thumb($img_name,$filename,$new_w,$new_h)
{
    $ext=getExtension($img_name);
    if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext))
        $src_img=imagecreatefromjpeg($img_name);
    if(!strcmp("png",$ext))
        $src_img=imagecreatefrompng($img_name);

    //gets the dimmensions of the image
    $old_x=imageSX($src_img);
    $old_y=imageSY($src_img);

    // next we will calculate the new dimmensions for the thumbnail image
    $ratio1=$old_x/$new_w;
    $ratio2=$old_y/$new_h;
    if($ratio1>$ratio2) {
        $thumb_w=$new_w;
        $thumb_h=$old_y/$ratio1;
    }
    else {
        $thumb_h=$new_h;
        $thumb_w=$old_x/$ratio2;
    }
    $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
    imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); // resize the big image to the new created one

    if(!strcmp("png",$ext)) // output the created image to the file. Now we will have the thumbnail into the file named by $filename
        imagepng($dst_img,$filename);
    else
        imagejpeg($dst_img,$filename);

    imagedestroy($dst_img);
    imagedestroy($src_img);
}
function getExtension($str) {
    $i = strrpos($str,".");
    if (!$i) { return ""; }
    $l = strlen($str) - $i;
    $ext = substr($str,$i+1,$l);
    return $ext;
}

$errors=0;
if(isset($_POST['submit']))
    {
    //reads the name of the file the user submitted for uploading
    $image=$_FILES['scrnsots']['name'];
    if ($image)
    {
        $filename = stripslashes($_FILES['scrnsots']['name']);
        // get the extension of the file in a lower case format
        $extension = getExtension($filename);
        $extension = strtolower($extension);
        // if it is not a known extension, we will suppose it is an error, print an error message
        //and will not upload the file, otherwise we continue
        if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png"))
        {
            echo '<h1>Unknown extension!</h1>';
            $errors=1;
        }
        else
        {
            $size=getimagesize($_FILES['scrnsots']['tmp_name']);
            $sizekb=filesize($_FILES['scrnsots']['tmp_name']);
            if ($sizekb > MAX_SIZE*102400)
            {
                echo '<h1>You have exceeded the size limit!</h1>';
                $errors=1;
            }
            $image_name= $image .''. time() .'.'.$extension;
            $newname="uploads/scrnsots/".$image_name;
            $copied = copy($_FILES['scrnsots']['tmp_name'], $newname);
            if (!$copied)
            {
                echo '<h1>Copy unsuccessfull!</h1>';
                $errors=1;
            }
            else
            {
                $thumb_name='uploads/scrnsots/thumb/thumb-'.$image_name;
                $thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT);
            }
        }
    }
}
if(isset($_POST['submit']) && !$errors)
{
    echo $thumb_name ."<br/>";


        echo "<div class='custom alert alert-success'>Successfully Added.<a href='#' class='close' data-dismiss='alert' aria-label='close'>&times;</a></div>";
}

但它只会创建拇指.我想要1个不同的图像 - 尺寸(高度 - 宽度).

Answer 1

经过如此多的尝试，我找到了答案。通过改变下面的一些东西

    else
    {
        $thumb_name='uploads/scrnsots/thumb/thumb-'.$image_name;
        $thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT);
    }

到

    else
    {
        $cars = array("300", "800", "1280","1366","1920");
        $arrlength = count($cars);
        for($x = 0; $x < $arrlength; $x++) {
        echo $cars[$x];
        $thumb_name='uploads/scrnsots/'.$cars[$x].'/thumb-'.$image_name_dash;
        $thumb=make_thumb($newname,$thumb_name,$cars[$x],$cars[$x]);
            list($width_main, $height_main, $type, $attr) = getimagesize($newname);
            list($og_image_w, $og_image_h, $type, $attr) = getimagesize("$thumb_name");
            echo "<br>";
        }
    }

它有效。完美。这个想法来自 http://www.w3schools.com/php/php_arrays.asp 我只是在我的目标路径中创建了 5 个文件夹，名为"300", "800", "1280","1366","1920".

然后呢，它完美地在特定文件夹中生成特定图像。说真的，我很高兴。