php生成h5

对于h5中生成海报大家都不陌生 最常见的方法是前端生成 用html2canvas  但是弊端就是画质太差 网上很多方法 但是依然不是很管用  最近做的h5中 用了php来生成 画质简直美得不行 分享给大家

/*** 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");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, $color);imagecopyresampled($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, $color);//如果是透明的gif或png做透明处理$ext = pathinfo($val['url']);if (array_key_exists('extension', $ext)) {if ($ext['extension'] == 'gif' || $ext['extension'] == 'png') {imageColorTransparent($canvas, $color); //颜色透明}}//关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'], $resWidth, $resHeight);//$val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']) - $val['width']:$val['left'];//如果left小于-1我这做成了计算让其水平居中if ($val['left'] < 0) {$val['left'] = ceil($backgroundWidth - $val['width']) / 2;}$val['top'] = $val['top'] < 0 ? $backgroundHeight - abs($val['top']) - $val['height'] : $val['top'];//放置图像imagecopymerge($imageRes, $canvas, $val['left'], $val['top'], $val['right'], $val['bottom'], $val['width'], $val['height'], $val['opacity']); //左，上，右，下，宽度，高度，透明度}}//处理文字if (!empty($config['text'])) {foreach ($config['text'] as $key => $val) {$val             = array_merge($textDefault, $val);list($R, $G, $B) = explode(',', $val['fontColor']);$fontColor       = imagecolorallocate($imageRes, $R, $G, $B);//$val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']):$val['left'];//如果left小于-1我这做成了计算让其水平居中if ($val['left'] < 0) {$fontBox     = imagettfbbox($val['fontSize'], 0, $val['fontPath'], $val['text']); //文字水平居中实质$val['left'] = ceil(($backgroundWidth - $fontBox[2]) / 2); //计算文字的水平位置}$val['top'] = $val['top'] < 0 ? $backgroundHeight - abs($val['top']) : $val['top'];imagettftext($imageRes, $val['fontSize'], $val['angle'], $val['left'], $val['top'], $fontColor, $val['fontPath'], $val['text']);}}//生成图片if (!empty($filename)) {$res = imagejpeg($imageRes, $filename, 90); //保存到本地imagedestroy($imageRes);if (!$res) {return false;}return $filename;} else {header("Content-type:image/png");imagejpeg($imageRes); //在浏览器上显示imagedestroy($imageRes);}
}
$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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