diff --git a/syntax/php.vim b/syntax/php.vim
index 9050265..f25b9fa 100644
--- a/syntax/php.vim
+++ b/syntax/php.vim
@@ -37,6 +37,8 @@
 "           php_sql_nowdoc = 1 for SQL syntax highlighting inside nowdocs (default: 1)
 "           b:sql_type_override = 'postgresql' for PostgreSQL syntax highlighting in current buffer (default: 'mysql')
 "           g:sql_type_default = 'postgresql' to set global SQL syntax highlighting language default (default: 'mysql')"
+"           php_xml_heredoc = 1 for XML syntax highlighting inside heredocs (default: 0)
+"           php_xml_nowdoc = 1 for XML syntax highlighting inside nowdocs (default: 0)
 "           php_html_in_strings = 1  for HTML syntax highlighting inside strings (default: 0)
 "           php_html_in_heredoc = 1 for HTML syntax highlighting inside heredocs (default: 1)
 "           php_html_in_nowdoc = 1 for HTML syntax highlighting inside nowdocs (default: 1)
@@ -158,6 +160,21 @@ if ((exists("php_sql_query") && php_sql_query) || (exists("php_sql_heredoc") &&
   endif
 endif
 
+if !exists("php_xml_heredoc")
+  let php_xml_heredoc=0
+endif
+
+if !exists("php_xml_nowdoc")
+  let php_xml_nowdoc=0
+endif
+
+if ((exists("php_xml_heredoc") && php_xml_heredoc) || (exists("php_xml_nowdoc") && php_xml_nowdoc))
+  syn include @xmlTop syntax/xml.vim
+
+  syn sync clear
+  unlet! b:current_syntax
+endif
+
 " set default for php_folding so we don't have to keep checking its existence.
 if !exists("php_folding")
   let php_folding = 0
@@ -665,6 +682,9 @@ if version >= 704
   if (exists("php_sql_heredoc") && php_sql_heredoc)
     SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(sql\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@sqlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
   endif
+  if (exists("php_xml_heredoc") && php_xml_heredoc)
+    SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(xml\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@xmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
+  endif
   " @end phpHereDoc
 else
   " @copy phpHereDoc strip_maximum_size
@@ -678,6 +698,9 @@ else
   if (exists("php_sql_heredoc") && php_sql_heredoc)
     SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@<=\z(\(\I\i*\)\=\(sql\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@sqlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
   endif
+  if (exists("php_xml_heredoc") && php_xml_heredoc)
+    SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@<=\z(\(\I\i*\)\=\(xml\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@xmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
+  endif
   " @end phpHereDoc
 endif
 
@@ -693,6 +716,9 @@ if version >= 704
   if (exists("php_sql_nowdoc") && php_sql_nowdoc)
     SynFold syn region phpNowDoc matchgroup=Delimiter start=+\(<<<\)\@3<='\z(\(\I\i*\)\=\(sql\)\c\(\i*\)\)'$+ end="^\z1\(;\=$\)\@=" contained contains=@sqlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
   endif
+  if (exists("php_xml_nowdoc") && php_xml_nowdoc)
+    SynFold syn region phpNowDoc matchgroup=Delimiter start=+\(<<<\)\@3<='\z(\(\I\i*\)\=\(xml\)\c\(\i*\)\)'$+ end="^\z1\(;\=$\)\@=" contained contains=@xmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
+  endif
   " @end phpNowDoc
 else
   " @copy phpHereDoc strip_maximum_size
@@ -706,6 +732,9 @@ else
   if (exists("php_sql_heredoc") && php_sql_heredoc)
     SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@<=\z(\(\I\i*\)\=\(sql\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@sqlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
   endif
+  if (exists("php_xml_heredoc") && php_xml_heredoc)
+    SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@<=\z(\(\I\i*\)\=\(xml\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@xmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
+  endif
   " @end phpNowDoc
 endif