Error on PHP when not ending in ?>

in a PHP file, the closing tag is optional.

This works in html-minifier:
```php
//begining of file

//end of file
```

This gives an error in html-minifier:
```php
//begining of file

Start by reproducing the two PHP examples in html-minifier and trace the parsing path that handles the optional closing tag. Done means a PHP file without ?> no longer errors while the existing example with ?> continues to be processed correctly.

Written by the indexing model from the issue text.