How to generate promotional posters with PHP

This article mainly introduces the method of generating promotional posters in PHP, and analyzes in detail the relevant operating techniques and related precautions for PHP image generation based on specific examples. Friends in need can refer to the examples in this article

Describes the method of generating promotional posters in PHP. Share it with everyone for your reference. The details are as follows:

There is often a need to generate a promotional poster, including a specified QR code, and share it with others to determine the user recommendation relationship.

A careful analysis, the necessary elements for promoting posters are poster background images and QR codes, both of which are easy to generate, but they need to be combined into a two-dimensional image that can be saved to It is easy to share locally, but this is the difficulty. In H5, you can use canvas to draw to complete functions similar to screenshots, but there are many limitations in putting it in a small program. Then we generate the poster directly in the background and call it directly in the front desk.

Preliminary preparation:

1. Poster background image. The background image is generally stored on the server and read locally by the program;
2. Promotion The QR code can be a QR code image link or a string image stream. If you generate the QR code yourself, see for details: Use phpqrcode to generate a QR code.

The method is as follows:

/**
 * 生成宣传海报
 * @param array  参数,包括图片和文字
 * @param string  $filename 生成海报文件名,不传此参数则不生成文件,直接输出图片
 * @return [type] [description]
 */
function createPoster($config=array(),$filename=""){
  //如果要看报什么错，可以先注释调这个header
  if(empty($filename)) header("content-type: image/png");
  $imageDefault = array(
    'left'=>0,
    'top'=>0,
    'right'=>0,
    'bottom'=>0,
    'width'=>100,
    'height'=>100,
    'opacity'=>100
  );
  $textDefault = array(
    'text'=>'',
    'left'=>0,
    'top'=>0,
    'fontSize'=>32,       //字号
    'fontColor'=>'255,255,255', //字体颜色
    'angle'=>0,
  );
  $background = $config['background'];//海报最底层得背景
  //背景方法
  $backgroundInfo = getimagesize($background);
  $backgroundFun = 'imagecreatefrom'.image_type_to_extension($backgroundInfo[2], false);
  $background = $backgroundFun($background);
  $backgroundWidth = imagesx($background);  //背景宽度
  $backgroundHeight = imagesy($background);  //背景高度
  $imageRes = imageCreatetruecolor($backgroundWidth,$backgroundHeight);
  $color = imagecolorallocate($imageRes, 0, 0, 0);
  imagefill($imageRes, 0, 0, $color);
  // imageColorTransparent($imageRes, $color);  //颜色透明
  imagecopyresampled($imageRes,$background,0,0,0,0,imagesx($background),imagesy($background),imagesx($background),imagesy($background));
  //处理了图片
  if(!empty($config['image'])){
    foreach ($config['image'] as $key => $val) {
      $val = array_merge($imageDefault,$val);
      $info = getimagesize($val['url']);
      $function = 'imagecreatefrom'.image_type_to_extension($info[2], false);
      if($val['stream']){   //如果传的是字符串图像流
        $info = getimagesizefromstring($val['url']);
        $function = 'imagecreatefromstring';
      }
      $res = $function($val['url']);
      $resWidth = $info[0];
      $resHeight = $info[1];
      //建立画板 ，缩放图片至指定尺寸
      $canvas=imagecreatetruecolor($val['width'], $val['height']);
      imagefill($canvas, 0, 0, $color);
      //关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）
      imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'],$resWidth,$resHeight);
      $val[&#39;left&#39;] = $val[&#39;left&#39;]<0?$backgroundWidth- abs($val[&#39;left&#39;]) - $val[&#39;width&#39;]:$val[&#39;left&#39;];
      $val[&#39;top&#39;] = $val[&#39;top&#39;]<0?$backgroundHeight- abs($val[&#39;top&#39;]) - $val[&#39;height&#39;]:$val[&#39;top&#39;];
      //放置图像
      imagecopymerge($imageRes,$canvas, $val[&#39;left&#39;],$val[&#39;top&#39;],$val[&#39;right&#39;],$val[&#39;bottom&#39;],$val[&#39;width&#39;],$val[&#39;height&#39;],$val[&#39;opacity&#39;]);//左，上，右，下，宽度，高度，透明度
    }
  }
  //处理文字
  if(!empty($config[&#39;text&#39;])){
    foreach ($config[&#39;text&#39;] as $key => $val) {
      $val = array_merge($textDefault,$val);
      list($R,$G,$B) = explode(&#39;,&#39;, $val[&#39;fontColor&#39;]);
      $fontColor = imagecolorallocate($imageRes, $R, $G, $B);
      $val[&#39;left&#39;] = $val[&#39;left&#39;]<0?$backgroundWidth- abs($val[&#39;left&#39;]):$val[&#39;left&#39;];
      $val[&#39;top&#39;] = $val[&#39;top&#39;]<0?$backgroundHeight- abs($val[&#39;top&#39;]):$val[&#39;top&#39;];
      imagettftext($imageRes,$val[&#39;fontSize&#39;],$val[&#39;angle&#39;],$val[&#39;left&#39;],$val[&#39;top&#39;],$fontColor,$val[&#39;fontPath&#39;],$val[&#39;text&#39;]);
    }
  }
  //生成图片
  if(!empty($filename)){
    $res = imagejpeg ($imageRes,$filename,90); //保存到本地
    imagedestroy($imageRes);
    if(!$res) return false;
    return $filename;
  }else{
    imagejpeg ($imageRes);     //在浏览器上显示
    imagedestroy($imageRes);
  }
}

Usage example one: Generate with Poster of QR code

$config = array(
  'image'=>array(
    array(
      'url'=>'qrcode/qrcode.png',     //二维码资源
      'stream'=>0,
      'left'=>116,
      'top'=>-216,
      'right'=>0,
      'bottom'=>0,
      'width'=>178,
      'height'=>178,
      'opacity'=>100
    )
  ),
  'background'=>'bg/bg1.jpg'          //背景图
);
$filename = 'bg/'.time().'.jpg';
//echo createPoster($config,$filename);
echo createPoster($config);

##Usage example 2: Generate a QR code with image, nickname and QR code Poster

$config = array(
  'text'=>array(
    array(
      'text'=>'昵称',
      'left'=>182,
      'top'=>105,
      'fontPath'=>'qrcode/simhei.ttf',     //字体文件
      'fontSize'=>18,             //字号
      'fontColor'=>'255,0,0',       //字体颜色
      'angle'=>0,
    )
  ),
  'image'=>array(
    array(
      'url'=>'qrcode/qrcode.png',       //图片资源路径
      'left'=>130,
      'top'=>-140,
      'stream'=>0,             //图片资源是否是字符串图像流
      'right'=>0,
      'bottom'=>0,
      'width'=>150,
      'height'=>150,
      'opacity'=>100
    ),
    array(
      'url'=>'https://wx.qlogo.cn/mmopen/vi_32/DYAIOgq83eofD96opK97RXwM179G9IJytIgqXod8jH9icFf6Cia6sJ0fxeILLMLf0dVviaF3SnibxtrFaVO3c8Ria2w/0',
      'left'=>120,
      'top'=>70,
      'right'=>0,
      'stream'=>0,
      'bottom'=>0,
      'width'=>55,
      'height'=>55,
      'opacity'=>100
    ),
  ),
  'background'=>'qrcode/bjim.jpg',
);
$filename = 'qrcode/'.time().'.jpg';
//echo createPoster($config,$filename);
echo createPoster($config);

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