Detailed explanation of steps to generate promotional posters with PHP

This time I will bring you a detailed explanation of the steps to generate promotion posters with PHP. What are the precautions for generating promotion posters with PHP? Here are practical cases, let’s take a look.

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 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.海报背景图，背景图一般存服务器，程序本地读取；
2.推广二维码，可以是二维码图片链接，也可以是字符串图像流，如果自己生成二维码，详见：使用phpqrcode生成二维码。

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 example1: Generate a poster with a QR code

//2. 在生成的二维码中加上logo(生成图片文件) 
function scerweima1($url=''){ 
require_once 'phpqrcode.php'; 
$value = $url; //二维码内容 
$errorCorrectionLevel = 'H'; //容错级别 
$matrixPointSize = 6; //生成图片大小 
//生成二维码图片 
$filename = 'qrcode/'.microtime().'.png'; 
QRcode::png($value,$filename , $errorCorrectionLevel, $matrixPointSize, 2); 
$logo = 'qrcode/logo.jpg'; //准备好的logo图片 
$QR = $filename; //已经生成的原始二维码图 
if (file_exists($logo)) { 
$QR = imagecreatefromstring(file_get_contents($QR)); //目标图象连接资源。 
$logo = imagecreatefromstring(file_get_contents($logo)); //源图象连接资源。 
$QR_width = imagesx($QR); //二维码图片宽度 
$QR_height = imagesy($QR); //二维码图片高度 
$logo_width = imagesx($logo); //logo图片宽度 
$logo_height = imagesy($logo); //logo图片高度 
$logo_qr_width = $QR_width / 4; //组合之后logo的宽度(占二维码的1/5) 
$scale = $logo_width/$logo_qr_width; //logo的宽度缩放比(本身宽度/组合后的宽度) 
$logo_qr_height = $logo_height/$scale; //组合之后logo的高度 
$from_width = ($QR_width - $logo_qr_width) / 2; //组合之后logo左上角所在坐标点 
//重新组合图片并调整大小 
/*
imagecopyresampled() 将一幅图像(源图象)中的一块正方形区域拷贝到另一个图像中 
*/ 
imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width,$logo_qr_height, $logo_width, $logo_height); 
} 
//输出图片 
imagepng($QR, 'qrcode.png'); 
imagedestroy($QR); 
imagedestroy($logo); 
return &#39;<img src="qrcode.png" alt="使用微信扫描支付">&#39;; 
} 
//调用查看结果 
echo scerweima1(&#39;https://www.baidu.com&#39;);

Usage Example 2: Generate posters with images, nicknames and QR codes

$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);

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other php Chinese websites related articles!

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