Sharing how to generate promotional posters with PHP

This article mainly shares with you how to use PHP to generate promotional posters and several sample codes. Friends in need can refer to it!

There is often a need to generate a promotional poster, including a specified QR code, and share it with others to scan the code 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 one The two-dimensional picture needs to be saved locally for sharing. This is the difficulty. In H5, you can use canvas to draw it 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.

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);
}
}

Summary: This achieves a simple way to count the number of fans invited by the promoter.

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