" Env Variables
syn keyword     phpEnvVar       GATEWAY_INTERFACE SERVER_NAME SERVER_SOFTWARE SERVER_PROTOCOL REQUEST_METHOD QUERY_STRING DOCUMENT_ROOT HTTP_ACCEPT HTTP_ACCEPT_CHARSET HTTP_ENCODING HTTP_ACCEPT_LANGUAGE HTTP_CONNECTION HTTP_HOST HTTP_REFERER HTTP_USER_AGENT REMOTE_ADDR REMOTE_PORT SCRIPT_FILENAME SERVER_ADMIN SERVER_PORT SERVER_SIGNATURE PATH_TRANSLATED SCRIPT_NAME REQUEST_URI     contained

" Internal Variables
syn keyword     phpIntVar GLOBALS HTTP_GET_VARS HTTP_POST_VARS HTTP_COOKIE_VARS 
HTTP_POST_FILES HTTP_ENV_VARS HTTP_SERVER_VARS PHP_ERRMSG PHP_SELF HTTP_RAW_POST_DATA HTTP_STATE_VARS _GET _POST _COOKIE _SERVER _ENV   contained

" Function names
syn keyword     phpFunctions    apache_lookup_uri apache_note ascii2ebcdic ebcdic2ascii getallheaders virtual apache_child_terminate apache_setenv      contained

syn keyword     phpFunctions    array array_change_key_case array_chunk array_count_values array_diff array_filter array_flip array_fill array_intersect array_key_exists array_keys array_map array_merge array_merge_recursive array_multisort array_pad array_pop array_push array_rand array_reverse array_reduce array_shift array_slice array_splice array_sum array_unique array_unshift array_values array_walk arsort asort compact count current each end extract in_array array_search key krsort ksort list natsort natcasesort next pos prev range reset rsort shuffle sizeof sort uasort uksort usort     contained
 
 " Comment
syn region      phpComment      start="/\*" end="\*/"   contained contains=phpTodo extend
syn match       phpComment      "#.\{-}\(?>\|$\)\@="    contained contains=phpTodo
syn match       phpComment      "//.\{-}\(?>\|$\)\@="   contained contains=phpTodo