php - 将一个图像添加到另一个图像中

Question

我正在尝试将图像添加到模板，该模板也是另一幅图像；我正在使用 PHP codeigniter；当两个文件都是 .PNG 文件时，我有一段很好的代码可以很好地用于此目的；我的代码如下:

<?php

function attachIcon($imgname)
{
    $mark = imagecreatefrompng($imgname);
 imagesavealpha($mark, true);

    list($icon_width, $icon_height) = getimagesize($imgname);

    $img = imagecreatefrompng('images/sprites/navIcons.png');
 imagesavealpha($img, true);

    $move_left = 10;
    $move_up = 9;

    list($mainpic_width, $mainpic_height) = getimagesize('images/sprites/navIcons.png');
    imagecopy($img, $mark, $mainpic_width-$icon_width-$move_left, $mainpic_height-$icon_height-$move_up, 0, 0, $icon_width, $icon_height);
    imagepng($img);  // display the image + positioned icon in the browser
  //imagepng($img,'newnavIcon.png'); // rewrite the image with icon attached.
}

header('Content-Type: image/png');
 attachIcon('icon.png');
?>

但是，如果模板“images/sprites/navIcons.png”是一个 png 文件，而另一个图像是另一种类型(比如 .JPG)，我的以下代码将无法正常工作:

<?php

function attachIcon($imgname)
{
    $mark = imagecreatefrompng($imgname);
 imagesavealpha($mark, true);

    list($icon_width, $icon_height) = getimagesize($imgname);

    $img = imagecreatefrompng('images/sprites/navIcons.png');
 imagesavealpha($img, true);

    $move_left = 10;
    $move_up = 9;

    list($mainpic_width, $mainpic_height) = getimagesize('images/sprites/navIcons.png');
    imagecopy($img, $mark, $mainpic_width-$icon_width-$move_left, $mainpic_height-$icon_height-$move_up, 0, 0, $icon_width, $icon_height);
    imagepng($img);  // display the image + positioned icon in the browser
  //imagepng($img,'newnavIcon.png'); // rewrite the image with icon attached.
}

header('Content-Type: image/jpg');
 attachIcon('icon.jpg');
?>

-Am I missing anything? - Is it supposed to work with any file extensions? - can the template be .PNG file and the other image another type (lets say .JPG)!May be I need to change something;

感谢任何帮助!

PS:我从这个论坛的一个很老的帖子中得到了代码；但我认为它很旧而且没有人检查它，所以这就是为什么我在一个新线程中问我的问题!谢谢

---

感谢 sinni800，

我本来应该在评论中回复你的，但因为我想添加我的代码，所以我在这里添加了一条新消息来回复。

我也尝试了以下代码，其中我使用了“imagecreatefromjpeg”；我的代码:

<?php

       function attachIcon($imgname) {
            $mark = imagecreatefromjpeg($imgname);
            imagesavealpha($mark, true);

            list($icon_width, $icon_height) = getimagesize($imgname);

            $img = imagecreatefrompng(base_url() . '/uploaded_images/output/viewer.png');
            imagesavealpha($img, true);

            $move_left = 280;
            $move_up = 450;

            list($mainpic_width, $mainpic_height) = getimagesize(base_url() . '/uploaded_images/output/viewer.png');
            imagecopy($img, $mark, $mainpic_width - $icon_width - $move_left, $mainpic_height - $icon_height - $move_up, 0, 0, $icon_width, $icon_height);
            imagepng($img);  // display the image + positioned icon in the browser
            //imagepng($img,'newnavIcon.png'); // rewrite the image with icon attached.
        }

        header('Content-Type: image/jpeg');

        attachIcon( base_url().'/uploaded_images/output/koala.jpg');
?>

但还是不行!

Answer 1

我想 @sinni800 希望你做这样的事情。

<?php
function open_image ($file) {
    $size=getimagesize($file);
    switch($size["mime"]){
        case "image/jpeg":
            $im = imagecreatefromjpeg($file); //jpeg file
        break;
        case "image/gif":
            $im = imagecreatefromgif($file); //gif file
      break;
      case "image/png":
          $im = imagecreatefrompng($file); //png file
      break;
      default: 
          $im=false;
      break;
    }
    return $im;
}


function attachIcon($imgname)
{
    $mark = open_image($imgname);
    if($mark !== false){
        imagesavealpha($mark, true);

        list($icon_width, $icon_height) = getimagesize($imgname);

        $img = imagecreatefrompng('images/sprites/navIcons.png');
        imagesavealpha($img, true);

        $move_left = 10;
        $move_up = 9;

        list($mainpic_width, $mainpic_height) = getimagesize('images/sprites/navIcons.png');
        imagecopy($img, $mark, $mainpic_width-$icon_width-$move_left, $mainpic_height-$icon_height-$move_up, 0, 0, $icon_width, $icon_height);
        imagepng($img);  // display the image + positioned icon in the browser
    }
}

header('Content-Type: image/png');
attachIcon('icon.png');
?>