This is an archived bug report. If you are experiencing a similar issue, upgrade to the latest release and if that does not solve the problem, submit a new bug report
I have a few templates that do not render at all – the page loads completely blank (no PHP errors are shown, no matter the debug setting). They used to load on my EE2 site, but no longer do on EE3. (I am in the middle of taking a site from EE 2.9.0 to EE 3.5.10.) The root of the issue seems to be with how the template is parsed. This is from system/ee/EllisLab/ExpressionEngine/Library/Parser/Conditional/Parser.php
public function parse()
{
$this->openBuffer();
do
{
$this->next();
$this->template();
}
while (count($this->tokens));
$this->expect('EOS');
$out = $this->closeBuffer(FALSE);
return preg_replace('/^\n?(.*?)\n?$/is', '$1', $out);
}For these templates that do not load, the preg_replace function returns null instead of a string. This comment from the PHP manual was helpful to me: http://php.net/manual/en/function.preg-replace.php#84285 Basically, I think there is too much content in the page markup, so the preg_replace command fails and returns NULL. I have tested out changing the regex to be not greedy (preg_replace('/^\n?(.*?)\n?$/isU', '$1', $out);) and the templates render successfully. Is it possible to changing the regex to be non-greedy site wide?
In system/ee/EllisLab/ExpressionEngine/Library/Parser/Conditional/Parser.php replace line 75 with:
if ($out && $out[0] == "\n" && substr($out, -1) == "\n")
{
$out = substr($out, 1);
$out = substr($out, 0, strlen($out) - 1);
}
return $out;ExpressionEngine implements Markdown Extra and BBCode. Please see the Markdown Extra docs and the BBCode Wikipedia article for a full reference.
**bold**, __bold__, *italics*, _italics_, ~strike/del~, `code()`
bold, italics, strike/del, code()
Link: [link title](https://example.com)
Image: 
[blockquote]...[/blockquote], [quote]...[/quote], and Markdown style:
> Some quoted text. > > This is all one quote.
[code]...[/code], and you can also specify the language for syntax highlighting, [code=php]...[/code]
GitHub flavored Markdown code fences are also supported:
```
public function decoderRing($str)
{
return str_rot13($str);
}
```