Example of merging multiple images into one using PHP image processing

How does PHP perform image processing? Is it possible to combine multiple pictures into one? This article uses PHP to combine multiple pictures into one, so that everyone can have a clearer understanding of PHP's picture processing.

1. Multiple pictures are combined into one, for example:

The picture combination can be displayed on the browser and saved to the folder at the same time

An example is as follows:

<?php 
 /** 
 * 图片合并 
 **/ 
 
 $pic_list  = array( 
  &#39;img2.png&#39;, 
  &#39;img2.png&#39;, 
  &#39;logo.png&#39;, 
  &#39;logo.png&#39;, 
  &#39;logo.png&#39;, 
  &#39;img2.png&#39;, 
  &#39;img2.png&#39;, 
  &#39;img2.png&#39;, 
  &#39;img2.png&#39; 
 ); 
  
 $pic_list = array_slice($pic_list, 0, 9); // 只操作前9个图片 
 
 $bg_w = 150; // 背景图片宽度 
 $bg_h = 150; // 背景图片高度 
 
 $background = imagecreatetruecolor($bg_w,$bg_h); // 背景图片 
 $color = imagecolorallocate($background, 202, 201, 201); // 为真彩色画布创建白色背景，再设置为透明 
 imagefill($background, 0, 0, $color); 
 imageColorTransparent($background, $color); 
 
 $pic_count = count($pic_list); 
 $lineArr = array(); // 需要换行的位置 
 $space_x = 3; 
 $space_y = 3; 
 $line_x = 0; 
 switch($pic_count) { 
 case 1: // 正中间 
  $start_x = intval($bg_w/4); // 开始位置X 
  $start_y = intval($bg_h/4); // 开始位置Y 
  $pic_w = intval($bg_w/2); // 宽度 
  $pic_h = intval($bg_h/2); // 高度 
  break; 
 case 2: // 中间位置并排 
  $start_x = 2; 
  $start_y = intval($bg_h/4) + 3; 
  $pic_w = intval($bg_w/2) - 5; 
  $pic_h = intval($bg_h/2) - 5; 
  $space_x = 5; 
  break; 
 case 3: 
  $start_x = 40; // 开始位置X 
  $start_y = 5; // 开始位置Y 
  $pic_w = intval($bg_w/2) - 5; // 宽度 
  $pic_h = intval($bg_h/2) - 5; // 高度 
  $lineArr = array(2); 
  $line_x = 4; 
  break; 
 case 4: 
  $start_x = 4; // 开始位置X 
  $start_y = 5; // 开始位置Y 
  $pic_w = intval($bg_w/2) - 5; // 宽度 
  $pic_h = intval($bg_h/2) - 5; // 高度 
  $lineArr = array(3); 
  $line_x = 4; 
  break; 
 case 5: 
  $start_x = 30; // 开始位置X 
  $start_y = 30; // 开始位置Y 
  $pic_w = intval($bg_w/3) - 5; // 宽度 
  $pic_h = intval($bg_h/3) - 5; // 高度 
  $lineArr = array(3); 
  $line_x = 5; 
  break; 
 case 6: 
  $start_x = 5; // 开始位置X 
  $start_y = 30; // 开始位置Y 
  $pic_w = intval($bg_w/3) - 5; // 宽度 
  $pic_h = intval($bg_h/3) - 5; // 高度 
  $lineArr = array(4); 
  $line_x = 5; 
  break; 
 case 7: 
  $start_x = 53; // 开始位置X 
  $start_y = 5; // 开始位置Y 
  $pic_w = intval($bg_w/3) - 5; // 宽度 
  $pic_h = intval($bg_h/3) - 5; // 高度 
  $lineArr = array(2,5); 
  $line_x = 5; 
  break; 
 case 8: 
  $start_x = 30; // 开始位置X 
  $start_y = 5; // 开始位置Y 
  $pic_w = intval($bg_w/3) - 5; // 宽度 
  $pic_h = intval($bg_h/3) - 5; // 高度 
  $lineArr = array(3,6); 
  $line_x = 5; 
  break; 
 case 9: 
  $start_x = 5; // 开始位置X 
  $start_y = 5; // 开始位置Y 
  $pic_w = intval($bg_w/3) - 5; // 宽度 
  $pic_h = intval($bg_h/3) - 5; // 高度 
  $lineArr = array(4,7); 
  $line_x = 5; 
  break; 
 } 
 foreach( $pic_list as $k=>$pic_path ) { 
  $kk = $k + 1; 
  if ( in_array($kk, $lineArr) ) { 
   $start_x = $line_x; 
   $start_y = $start_y + $pic_h + $space_y; 
  } 
  $pathInfo = pathinfo($pic_path); 
  switch( strtolower($pathInfo[&#39;extension&#39;]) ) { 
   case &#39;jpg&#39;: 
   case &#39;jpeg&#39;: 
    $imagecreatefromjpeg = &#39;imagecreatefromjpeg&#39;; 
   break; 
   case &#39;png&#39;: 
    $imagecreatefromjpeg = &#39;imagecreatefrompng&#39;; 
   break; 
   case &#39;gif&#39;: 
   default: 
    $imagecreatefromjpeg = &#39;imagecreatefromstring&#39;; 
    $pic_path = file_get_contents($pic_path); 
   break; 
  } 
  $resource = $imagecreatefromjpeg($pic_path); 
  // $start_x,$start_y copy图片在背景中的位置 
  // 0,0 被copy图片的位置 
  // $pic_w,$pic_h copy后的高度和宽度 
  imagecopyresized($background,$resource,$start_x,$start_y,0,0,$pic_w,$pic_h,imagesx($resource),imagesy($resource)); // 最后两个参数为原始图片宽度和高度，倒数两个参数为copy时的图片宽度和高度 
  $start_x = $start_x + $pic_w + $space_x; 
 } 
 
 header("Content-type: image/jpg"); 
 imagejpeg($background);
 imagegif($background, "./hero_gam.png"); 
  
?>

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