Daichong'blog

简介

 近年小程序、微信发展迅速。微信、微博病毒式传播使用户从传统的APP上向即扫即用、无需安装的小程序上转化。而微信公众号、小程序的迅速发展离不开转发、二维码分享。

 但是二维码形式单一,对用户来说毫无吸引力。纯粹依靠‘吆喝、金钱、礼物吸引’方式已经变得愈来愈无价值。

 对于’视觉动物’和大部分用户来说,精美的图片加上二维码的组合更具有吸引力。

php生成海报图前提条件

  • gd库扩展

上代码

生成方法
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// 生成方法
private function createPoster($data)
{
$poster = new Poster();
//创建画布
$im = $poster->createTrueColor(672, 1060);
//字体文件
$font_file = $this->typeface;
// 商品图片
$goodsImg = $poster->createImgBoard($im, $data['goodsPath'], 0, 0, 672, 668);
//二维码
$codeImg = $poster->createImgBoard($im, $data['qrcode'], 410, 710, 225, 225);
//headimg
$headImg = $poster->createImgBoard($im, $data['headimg'], 46, 942, 65, 65);
//btnimg
$btnimg = $poster->createImgBoard($im, $data['btn'], 420, 960, 220, 48);

// 价格
$price_font = ImageColorAllocate($im, 248, 6, 74);
imagettftext($im, 25, 0, 41, 759, $price_font, $font_file, '¥');
imagettftext($im, 38, 0, 60, 760, $price_font, $font_file, $data["price"]);

// 商品名称
$goodsName = trim(mb_substr($data['title'], 0, 20));
$good_font = ImageColorAllocate($im, 1, 1, 1);
imagettftext($im, 24, 0, 40, 820, $good_font, $font_file, $poster->AutoWrap(12, 0, $font_file, $goodsName, 160));

// 昵称
$nickname = trim(mb_substr($data['nickname'], 0, 8));
$nick_font = ImageColorAllocate($im, 109, 114, 120);
imagettftext($im, 16, 0, 130, 965, $nick_font, $font_file, $poster->AutoWrap(12, 0, $font_file, $nickname, 80));
imagettftext($im, 16, 0, 130, 1000, $nick_font, $font_file, $data['time']);
ob_clean();
ob_end_clean();
// 输出图片
$poster->lookImg($im);

//释放空间
imagedestroy($im);
imagedestroy($btnimg);
imagedestroy($goodsImg);
imagedestroy($codeImg);
imagedestroy($headImg);
// 删除本地二维码
Qrcode::deleteCode($data['qrcode']);
}
实现类
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// 具体类
<?php
namespace app\library;

/**
* 生成海报图
* @author daichongweb
* @url daichongweb.cn,daichongweb.com
*/
class Poster
{
/**
* 从图片文件创建Image资源
* @param $file 图片文件,支持url
* @return bool|resource 成功返回图片image资源,失败返回false
*/
public function createImageFromFile($file)
{
if (preg_match('/http(s)?:\/\//', $file)) {
$fileSuffix = self::getNetworkImgType($file);
} else {
$file_info = getimagesize($file);
$fileSuffix = $file_info[2];
// $fileSuffix = pathinfo($file, PATHINFO_EXTENSION);
}

if (!$fileSuffix) return false;

switch ($fileSuffix) {
/*case 'jpeg':
$theImage = @imagecreatefromjpeg($file);
break;*/
case '2':
$theImage = imagecreatefromjpeg($file);
break;
case '3':
$theImage = @imagecreatefrompng($file);
break;
case '1':
$theImage = @imagecreatefromgif($file);
break;
default:
$theImage = @imagecreatefromstring(file_get_contents($file));
break;
}

return $theImage;
}

// 文字换行
public function AutoWrap($fontsize, $angle, $fontface, $string, $width)
{
$content = "";
for ($i = 0; $i < mb_strlen($string); $i++) {
$letter[] = mb_substr($string, $i, 1);
}

foreach ($letter as $l) {
$teststr = $content . "" . $l;
$testbox = imagettfbbox($fontsize, $angle, $fontface, $teststr);
if (($testbox[2] > $width) && ($content !== "")) {
$content .= "\n";
}
$content .= $l;
}
$content = mb_convert_encoding($content, "html-entities", "utf-8");
return $content;
}

public function getNetworkImgType($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
curl_setopt($ch, CURLOPT_TIMEOUT, 3);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_exec($ch);
$http_code = curl_getinfo($ch);
curl_close($ch);

if ($http_code['http_code'] == 200) {
$theImgType = explode('/', $http_code['content_type']);

if ($theImgType[0] == 'image') {
return $theImgType[1];
} else {
return false;
}
} else {
return false;
}
}

/**
* 创建真彩画布
* @param int $width
* @param int $height
* @param int $r
* @param int $g
* @param int $b
* @return false|resource
*/
public function createTrueColor(int $width, int $height, $r = 255, $g = 255, $b = 255)
{
$im = imagecreatetruecolor($width, $height);
$color = imagecolorallocate($im, $r, $g, $b);
imagefill($im, 0, 0, $color);
return $im;
}

/**
* 创建图像画布
* @param $im
* @param $imgUrl
* @param $dst_w
* @param $dst_h
* @return bool|resource
*/
public function createImgBoard($im, $imgUrl, $dst_x, $dst_y, $dst_w, $dst_h)
{
list($width, $height) = getimagesize($imgUrl);
$imgBoard = Poster::createImageFromFile($imgUrl);
imagecopyresized($im, $imgBoard, $dst_x, $dst_y, 0, 0, $dst_w, $dst_h, $width, $height);
return $imgBoard;
}

/**
* @param $im
*/
public function lookImg($im)
{
header("Content-type:text/html;charset=utf-8");
Header("Content-Type: image/jpeg"); // jpeg 生成会更快,png生成速度慢但是高清
imagejpeg($im);
}
}
使用方法
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// 获取微信二维码
$codePath = Qrcode::createQrcode([
'scene' => $scene,
'page' => $path,
'width' => '112',
'auto_color' => false,
'line_color' => [
'r' => 0,
'g' => 0,
'b' => 0
]
]);
$data = [
'bg' => $this->bg,
'goodsPath' => $goodsPath,
'title' => $goodsName,
'price' => $goodsPrice,
'btn' => $this->btn,
'time' => date('Y-m-d H:i'),
'qrcode' => $codePath,
'headimg' => $userInfo->headimgurl ? $userInfo->headimgurl : $this->defaultHeadImg,
'nickname' => $userInfo->nickname ? $userInfo->nickname : '特抱抱'
];
$this->createPoster($data);

效果图



 从上面两个图很明显可以看出,第二张图下面被切掉了,而且电脑是打不开的。解决这个问题的关键在于ob_clean();ob_end_clean();两个函数。

解决方法

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// 清空缓冲区
ob_clean();
ob_end_clean();

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