在项目中需要把几张图片合并在一起，如下图

分别由头、身、腿三张图片合并起来

代码如下：

 1 function combineImage($head_img,$middle_img,$footer_img,$save_path){ 2     $source_w = 400; 3     $source_h = 1142; 4     //取头部图片大小 5     $head_size = getimagesize($head_img); 6     $head_height = $head_size['1']; 7     $head_width = $head_size['0']; 8     $head_start_x = floor(($source_w-$head_width)/2);//头部开始位置 9     //取中间图片大小10     $midd_size = getimagesize($middle_img);11     $midd_height = $midd_size['1'];12     $midd_width = $midd_size['0'];13     $midd_start_y = $head_height-15;//中间开始Y坐标，因为头部的图片底部有空白，所以减去1514     $midd_start_x = floor(($source_w-$midd_width)/2);15     16     //取底部图片大小17     $foot_size = getimagesize($footer_img);18     $foot_height = $foot_size[1];19     $foot_width = $foot_size[0];20     $foot_start_x = floor(($source_w-$foot_width)/2);//底部图片x坐标21     $foot_start_y = $source_h-$foot_height;//底部图片y坐标22     23     $head = imagecreatefrompng($head_img);24     $middle = imagecreatefrompng($middle_img);25     $footer = imagecreatefrompng($footer_img);26     27     $bg_img = imageCreatetruecolor($source_w,$source_h);//生成背景图片28     $color = imagecolorallocate($bg_img, 255, 255, 255); //设置白色背景29     imagefill($bg_img, 0, 0, $color);//背景色填充30     imageColorTransparent($bg_img, $color);//透明31     imagecopyresampled($bg_img,$head,$head_start_x,0,0,0,$head_width,$head_height,$head_width,$head_height);32     imagecopyresampled($bg_img,$middle,$midd_start_x , $midd_start_y,0,0,$midd_width,$midd_height,$midd_width,$midd_height);33     imagecopyresampled($bg_img,$footer,$foot_start_x , $foot_start_y,0,0,$foot_width,$foot_height,$foot_width,$foot_height);34     35     imagepng($bg_img,$save_path );36 }37 $head = dirname(__FILE__).'/public/images/head.png';38 $midd = dirname(__FILE__).'/public/images/midd1.png';39 $foot = dirname(__FILE__).'/public/images/foot1.png';40 $save_path = dirname(__FILE__)."/public/images/testcomblie.png";41 combineImage($head,$midd,$foot,$save_path);