TCPDF 中文字導致空白頁面解決方法 / TCPDF some Non-ASCII character causing writeHTML empty output

最近使用TCPDF 遇到 writeHTML / writeHTMLCell 整個變成空白的 Bug

經自行 Debug 後發現問題出於 getHtmlDomArray(),
部分 preg_replace 會錯誤把部分字元替代錯誤, 最後導致整個HTML Block無效

官方解決前暫時解決方法是 Comment 掉 tcpdf.php 內這兩行

$html = preg_replace('/<([^\>\/]*)>[\s]/', '<\\1>&nbsp;', $html); // preserve some spaces
$html = preg_replace('/[\s]<\/([^\>]*)>/', '&nbsp;</\\1>', $html); // preserve some spaces

此問題已經回報到 TCPDF SorceForge Bug Tracker
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Recently I encountered a bug in TCPDF, which cause writeHTML / writeHTMLCell output blank when certain characters are inputted.

After debugging by myself, I found that the problem is caused by getHtmlDomArray(),
some preg_replace code will mess up whole HTML block if certain character appeared.

Meanwhile, it can be workaround by commenting out these two lines in tcpdf.php

$html = preg_replace('/<([^\>\/]*)>[\s]/', '<\\1>&nbsp;', $html); // preserve some spaces
$html = preg_replace('/[\s]<\/([^\>]*)>/', '&nbsp;</\\1>', $html); // preserve some spaces

This bug have been reported to TCPDF SorceForge Bug Tracker

Affected version: 6.2.9
Bug Tracker: https://sourceforge.net/p/tcpdf/bugs/1065/

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