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HomeBackend DevelopmentPHP Tutorialphp文本转图片自动换行的方法_php技巧

今天无意中浏览网面的时候发现一个长微博,它可以将文本转成png图片,于是乎就研究一下PHP文本转图片的方式,其实只要是用到了PHP的扩展库,GD库来生成图片,再通过图像函数生成,代码写出来后,发现如果文字太多了,图片就会超过屏幕的宽度,导致浏览器右拉条的出现,于是,想想有没有什么办法可以使图片能够自动换行,通过GG,发现了一篇文章,通过判断字符串和截取字符串再拼接起来实现文本图片自动换行,以下贴出此代码,以学习之中:

复制代码 代码如下:

header ("Content-type: image/png");
mb_internal_encoding("UTF-8"); // 设置编码

function autowrap($fontsize, $angle, $fontface, $string, $width) {
// 这几个变量分别是 字体大小, 角度, 字体名称, 字符串, 预设宽度
 $content = "";

 // 将字符串拆分成一个个单字 保存到数组 letter 中
 for ($i=0;$i  $letter[] = mb_substr($string, $i, 1);
 }

 foreach ($letter as $l) {
  $teststr = $content." ".$l;
  $testbox = imagettfbbox($fontsize, $angle, $fontface, $teststr);
  // 判断拼接后的字符串是否超过预设的宽度
  if (($testbox[2] > $width) && ($content !== "")) {
   $content .= "\n";
  }
  $content .= $l;
 }
 return $content;
}

$bg = imagecreatetruecolor(300, 290); // 创建画布
$white = imagecolorallocate($bg, 255, 255, 255); // 创建白色
$text = "前段时间练习使用 PHP 的 GD 库时,为了文本的自动换行纠结了很久。虽然可以通过插入 \n 实现换行,但考虑到文本中既有中文又有英文,强制限定每多少个文字就换行的效果很差。后来终于找到了一个英文下的自动换行的方法,其大概原理是将空格作为分隔符,将字符串分割为一个个单词,然后再一个接一个地拼接在一起,判断其长度是否超过画布,若超过则换行再拼接,否则继续拼接。考虑到中文需要将每个文字都拆开,所以我进行了一点修改,完整代码如下。";
$text = autowrap(12, 0, "simsun.ttc", $text, 280); // 自动换行处理

// 若文件编码为 GB2312 请将下行的注释去掉
// $text = iconv("GB2312", "UTF-8", $text);

imagettftext($bg, 12, 0, 10, 30, $white, "simsun.ttc", $text);
imagepng($bg);
imagedestroy($bg);
?>

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