小程序合成海报图片，高度自适应

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/**
*
获取要添加到画布的展示内容
* @param $text
内容
* @param int $fontsize 文字大小
* @param int $width
要展示的最大宽度
* @param int $height 要展示的最大高度
* @param int $fontHeight
字体高度
* @param int $eol_height
EOL高度
* @return array
*/
public static function getShowText($text, $fontsize = 24, $width = 650, $height = 800, $fontHeight = 60, $eol_height = 10)
{
$fontFile = public_path() . '/static/fonts/msyh.ttf';
$content = str_replace(" ", "", $text);
$arr = Util::spiltHtml($content);
$h = 0;
$contArr = array();
foreach ($arr as $item) {
if ($item['type'] == 'text') {
$conTxt = self::autoWrap($fontsize, $fontFile, $item['text'], $width);
$size = imagettfbbox($fontsize, 0, $fontFile, $conTxt);
$strArr = explode(PHP_EOL, $conTxt);
foreach ($strArr as $key => $item) {
if (empty($item)) {
$h += $eol_height;
$contArr[] = ['type' => 'text', 'str' => $item, 'lineheight' => $eol_height];
} else {
$h += $fontHeight;
$contArr[] = ['type' => 'text', 'str' => $item, 'lineheight' => $fontHeight];
}
if ($h >= $height) {
break 2;
}
}
} else if ($item['type'] == 'img') {
try{
$imginfo = getimagesize($item['src']);
$maxImgWidth = ceil($width / 2);
if ($imginfo[0] > $maxImgWidth) {
$srcH = ceil($width * $imginfo[1] / $imginfo[0]);
$h += intval(20 + $srcH);
$contArr[] = ['type' => 'img', 'str' => $item['src'], 'w' => $width, 'h' => $srcH];
} else {
$h += $imginfo[1];
$contArr[] = ['type' => 'img', 'str' => $item['src'], 'w' => $imginfo[0], 'h' => $imginfo[1]];
}
if ($h >= $height) {
break;
}
} catch (Exception $e){
continue;
}
}
}
$res = ['h' => $h, 'txtArr' => $contArr];
return $res;
}
/**
* @param $fontsize
字体大小
* @param $ttfpath
字体文件
* @param $str
字符串
* @param $width
最大宽度
* @param int $fontangle
将被度量的角度大小
* @param string $charset
编码
* @return string
*/
public static function autoWrap($fontsize, $ttfpath, $str, $width, $fontangle = 0, $charset = 'utf-8')
{
$len = mb_strlen($str);
$arr = array();
$tmpArr = array();
$tmpStr = '';
for ($i = 1; $i <= $len; $i++) {
$tmpStr = mb_substr($str, 0, $i);
$size = imagettfbbox($fontsize, $fontangle, public_path() . '/static/fonts/msyh.ttf', $tmpStr);
$w = $size[2];
if ($w < $width) {
if ($i < $len) {
continue;
} else {
return $tmpStr;
}
} else {
$arr[] = $tmpStr;
$str2 = mb_substr($str, $i);
$tmpStr .= PHP_EOL . self::autoWrap($fontsize, $ttfpath, $str2, $width);
}
break;
}
return trim($tmpStr, PHP_EOL);
}
/**
* 将html文字和图片分类成数组
* @param $str
* @return array
*/
public static function spiltHtml($str){
$content = stripslashes(strip_tags($str, "<img>"));
preg_match_all('/<img.*?src=["|'](.*?)["|']/',$content, $match);
$imgs = $match[1];
$res = preg_split('/<img(.*?)>/',$content);
foreach ($res as $key => $value) {
if($value != ""){
$result[] = array(
'type' => 'text',
'text' => htmlspecialchars($value, ENT_QUOTES, 'utf-8')
);
}
if(!empty($imgs[$key])){
$src = htmlspecialchars($imgs[$key], ENT_COMPAT , 'utf-8');
$result[] = array(
'type' => 'img',
'src' => $src
);
}
}
return $result;
}