Merge pull request doxygen#11846 from albert-github/feature/bug_php_end_heredoc

Initial space with end of heredoc.

Author: doxygen

src/scanner.l

@@ -2269,8 +2269,8 @@ NONLopt [^\n]*
                                           yyextra->delimiter = &yytext[1];
                                           BEGIN(HereDocEnd);
                                         }
-<HereDocEnd>^{ID}                       { // id at start of the line could mark the end of the block
-                                          if (yyextra->delimiter==yytext) // it is the end marker
+<HereDocEnd>^{Bopt}{ID}                 { // id at start of the line could mark the end of the block
+                                          if (yyextra->delimiter==QCString(yytext).stripWhiteSpace()) // it is the end marker
                                           {
                                             BEGIN(yyextra->lastHereDocContext);
                                           }