diff --git a/runtime/syntax/gnuplot.vim b/runtime/syntax/gnuplot.vim
index 7777cc9..9c98e67 100644
--- a/runtime/syntax/gnuplot.vim
+++ b/runtime/syntax/gnuplot.vim
@@ -3,7 +3,7 @@
 " Maintainer:	Josh Wainwright <wainwright DOT ja AT gmail DOT com>
 " Last Maintainer:	Andrew Rasmussen andyras@users.sourceforge.net
 " Original Maintainer:	John Hoelzel johnh51@users.sourceforge.net
-" Last Change:	2015-08-25
+" Last Change:	2020 May 12
 " Filenames:	*.gnu *.plt *.gpi *.gih *.gp *.gnuplot scripts: #!*gnuplot
 " URL:		http://www.vim.org/scripts/script.php?script_id=4873
 " Original URL:	http://johnh51.get.to/vim/syntax/gnuplot.vim
@@ -479,7 +479,7 @@
 
 " ---- Macros ---- "
 
-syn region gnuplotMacro		start="@" end=" "
+syn match gnuplotMacro		"@[a-zA-Z0-9_]*"
 
 " ---- Todos ---- "
 
diff --git a/runtime/syntax/masm.vim b/runtime/syntax/masm.vim
index abee78b..c3b2a9b 100644
--- a/runtime/syntax/masm.vim
+++ b/runtime/syntax/masm.vim
@@ -2,7 +2,7 @@
 " Language:	Microsoft Macro Assembler (80x86)
 " Orig Author:	Rob Brady <robb@datatone.com>
 " Maintainer:	Wu Yongwei <wuyongwei@gmail.com>
-" Last Change:	2020-05-07 17:04:10 +0800
+" Last Change:	2020-05-09 22:55:38 +0800
 
 " Quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -12,7 +12,7 @@
 let s:cpo_save = &cpo
 set cpo&vim
 
-setlocal iskeyword=@,48-57,_,36,60,62,63,@-@
+syn iskeyword @,48-57,_,36,60,62,63,@-@
 
 syn case ignore
 
diff --git a/runtime/syntax/pamenv.vim b/runtime/syntax/pamenv.vim
new file mode 100644
index 0000000..90359da
--- /dev/null
+++ b/runtime/syntax/pamenv.vim
@@ -0,0 +1,28 @@
+" Vim syntax file
+" Language:             pam_env.conf(5) configuration file
+" Latest Revision:      2020-05-10
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn keyword     pamenvTodo              contained TODO FIXME XXX NOTE
+syn region      pamenvComment           start='^#' end='$' display oneline contains=pamenvTodo,@Spells
+
+syn match       pamenvVars              '^[A-Z_][A-Z_0-9]*' nextgroup=pamenvKeywords skipwhite
+
+syn keyword     pamenvKeywords          contained DEFAULT OVERRIDE nextgroup=pamenvVarEq
+
+syn match       pamenvVarEq             contained '=' nextgroup=pamenvValue,pamenvValueWithQuote
+
+syn match       pamenvValue             contained '[^ \t]*' skipwhite nextgroup=pamenvKeywords
+syn region      pamenvValueWithQuote    contained start='"' end='"' skipwhite nextgroup=pamenvKeywords
+
+hi def link     pamenvTodo              Todo
+hi def link     pamenvComment           Comment
+hi def link     pamenvKeywords          Keyword
+hi def link     pamenvVars              Identifier
+hi def link     pamenvValue             String
+hi def link     pamenvValueWithQuote    String
+
+let b:current_syntax = "pamenv"
diff --git a/runtime/syntax/php.vim b/runtime/syntax/php.vim
index 04036fd..720d71e 100644
--- a/runtime/syntax/php.vim
+++ b/runtime/syntax/php.vim
@@ -1,9 +1,11 @@
 " Vim syntax file
 " Language: php PHP 3/4/5/7
-" Maintainer: Jason Woofenden <jason@jasonwoof.com>
-" Last Change: Oct 19, 2019
-" URL: https://jasonwoof.com/gitweb/?p=vim-syntax.git;a=blob;f=php.vim;hb=HEAD
-" Former Maintainers: Peter Hodge <toomuchphp-vim@yahoo.com>
+" Maintainer: Tyson Andre <tysonandre775@hotmail.com>
+" Last Change: May 11, 2020
+" URL: https://github.com/TysonAndre/vim-syntax
+" Former Maintainers: 
+"         Jason Woofenden <jason@jasonwoof.com>
+"         Peter Hodge <toomuchphp-vim@yahoo.com>
 "         Debian VIM Maintainers <pkg-vim-maintainers@lists.alioth.debian.org>
 "
 " Note: If you are using a colour terminal with dark background, you will
@@ -91,7 +93,7 @@
   syn cluster phpAddStrings add=@htmlTop
 endif
 
-" make sure we can use \ at the begining of the line to do a continuation
+" make sure we can use \ at the beginning of the line to do a continuation
 let s:cpo_save = &cpo
 set cpo&vim
 
@@ -314,7 +316,7 @@
   " define a cluster to get all interpolation syntaxes for double-quoted strings
   syn cluster phpInterpDouble contains=phpInterpSimple,phpInterpSimpleCurly,phpInterpDollarCurly1,phpInterpDollarCurly2,phpInterpBogusDollarCurley,phpInterpComplex
 
-" Methoden
+" Methods
 syn match phpMethodsVar "->\h\w*" contained contains=phpMethods,phpMemberSelector display
 
 " Include
@@ -328,14 +330,14 @@
 
 " Float
 " Refer to: https://www.php.net/manual/en/language.types.float.php
-syn match phpFloat "\%(\w\|\.\)\@<!\%(\d\|\.\)*\d\%(\d\|\.\)*\%([eE][+-]\=\%(\d\|\.\)\+\)\=\%(\w\|\.\)\@!" contained contains=phpFloatError display
-syn match phpFloatError "[eE.].*\." contained display
+syn match phpFloat "\%(\w\|\.\)\@<!\%(\d_\?\|\.\)*\d\%(\d\|_\|\.\)*\%([eE][+-]\=\%(\d\|_\|\.\)\+\)\=\%(\w\|\.\)\@!" contained contains=phpFloatError display
+syn match phpFloatError "\%([eE.][0-9._+-]*\.\|__\|_\(\>\|[eE]\)\|\(\>\|[eE]\)_\)" contained display
 
 " Number
-syn match phpNumber "\%(\.\)\@<!\<\%([1-9]\d*\|0\|0[xX]\x\+\)\>\%(\.\)\@!" contained display
+syn match phpNumber "\%(\.\)\@<!\<\%([1-9]\d*\|0\|0[xX]\(\x_\?\)*\x\)\>\%(\.\)\@!" contained display
 syn match phpNumber "\%(\.\)\@<!\<0\d\+\>\%(\.\)\@!" contained contains=phpOctalError display
 syn match phpBinaryError "[2-9]" contained display
-syn match phpNumber "\%(\.\)\@<!\<0[bB]\d\+\>\%(\.\)\@!" contained contains=phpBinaryError display
+syn match phpNumber "\%(\.\)\@<!\<0[bB]\(\d_\?\)*\d\>\%(\.\)\@!" contained contains=phpBinaryError display
 
 " Backslash escapes
 syn case match
@@ -442,6 +444,7 @@
 " match one line constructs here and skip them at folding
   syn keyword phpSCKeyword abstract final private protected public static contained
   syn keyword phpFCKeyword function contained
+  syn keyword phpDefine fn contained
   syn keyword phpStorageClass global contained
   syn match phpDefine "\(\s\|^\)\(abstract\s\+\|final\s\+\|private\s\+\|protected\s\+\|public\s\+\|static\s\+\)*function\(\s\+.*[;}]\)\@=" contained contains=phpSCKeyword
   syn match phpStructure "\(\s\|^\)\(abstract\s\+\|final\s\+\)*\(trait\|class\)\(\s\+.*}\)\@=" contained
@@ -459,7 +462,7 @@
   syn region phpFoldCatch matchgroup=Exception start="^\z(\s*\)catch\s\+\([^}]*$\)\@=" matchgroup=Delimiter end="^\z1}" contains=@phpClFunction,phpFoldFunction contained transparent fold extend
   syn region phpFoldTry matchgroup=Exception start="^\z(\s*\)try\s\+\([^}]*$\)\@=" matchgroup=Delimiter end="^\z1}" contains=@phpClFunction,phpFoldFunction contained transparent fold extend
 else
-  syn keyword phpDefine function contained
+  syn keyword phpDefine function fn contained
   syn keyword phpStructure abstract class trait interface contained
   syn keyword phpException catch throw try finally contained
   syn keyword phpStorageClass final global private protected public static contained
diff --git a/runtime/syntax/sh.vim b/runtime/syntax/sh.vim
index 0f4406d..3a2a6e7 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -2,8 +2,8 @@
 " Language:		shell (sh) Korn shell (ksh) bash (sh)
 " Maintainer:		Charles E. Campbell <NcampObell@SdrPchip.AorgM-NOSPAM>
 " Previous Maintainer:	Lennart Schultz <Lennart.Schultz@ecmwf.int>
-" Last Change:		Oct 16, 2019
-" Version:		189
+" Last Change:		Apr 14, 2020
+" Version:		190
 " URL:		http://www.drchip.org/astronaut/vim/index.html#SYNTAX_SH
 " For options and settings, please use:      :help ft-sh-syntax
 " This file includes many ideas from Eric Brunet (eric.brunet@ens.fr)
@@ -357,19 +357,18 @@
  syn region  shExDoubleQuote	matchGroup=Error start=+\$"+ skip=+\\\\\|\\.+ end=+"+	contains=shStringSpecial
 endif
 syn region  shSingleQuote	matchgroup=shQuote start=+'+ end=+'+		contains=@Spell	nextgroup=shSpecialStart,shSpecialSQ
-syn region  shDoubleQuote	matchgroup=shQuote start=+\%(\%(\\\\\)*\\\)\@<!"+ skip=+\\"+ end=+"+	contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
-syn region  shDoubleQuote	matchgroup=shQuote start=+"+ skip=+\\"+ end=+"+		contained contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
+syn region  shDoubleQuote	matchgroup=shQuote start=+\%(\%(\\\\\)*\\\)\@<!"+ skip=+\\.+ end=+"+	contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
+syn region  shDoubleQuote	matchgroup=shQuote start=+"+ matchgroup=shSpecial skip=+\\"+ end=+"+		contained	contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
 syn match   shStringSpecial	"[^[:print:] \t]"			contained
 syn match   shStringSpecial	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"			nextgroup=shComment
-syn match   shStringSpecial	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"
 syn match   shSpecialSQ	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"		contained	nextgroup=shBkslshSnglQuote,@shNoZSList
 syn match   shSpecialDQ	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"		contained	nextgroup=shBkslshDblQuote,@shNoZSList
 syn match   shSpecialStart	"\%(\\\\\)*\\[\\"'`$()#]"			contained	nextgroup=shBkslshSnglQuote,shBkslshDblQuote,@shNoZSList
 syn match   shSpecial	"^\%(\\\\\)*\\[\\"'`$()#]"
 syn match   shSpecialNoZS	contained	"\%(\\\\\)*\\[\\"'`$()#]"
 syn match   shSpecialNxt	contained	"\\[\\"'`$()#]"
-syn region  shBkslshSnglQuote	contained	matchgroup=shQuote start=+'+ end=+'+	contains=@Spell	nextgroup=shSpecialStart
-syn region  shBkslshDblQuote	contained	matchgroup=shQuote start=+"+ skip=+\\"+ end=+"+	contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
+"syn region  shBkslshSnglQuote	contained	matchgroup=shQuote start=+'+ end=+'+	contains=@Spell	nextgroup=shSpecialStart
+"syn region  shBkslshDblQuote	contained	matchgroup=shQuote start=+"+ skip=+\\"+ end=+"+	contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
 
 " Comments: {{{1
 "==========
@@ -454,13 +453,13 @@
  syn match  shDerefWordError	"[^}$[~]"	contained
 endif
 syn match  shDerefSimple	"\$\%(\h\w*\|\d\)"	nextgroup=@shNoZSList
-syn region shDeref	matchgroup=PreProc start="\${" end="}"	contains=@shDerefList,shDerefVarArray
+syn region shDeref	matchgroup=PreProc start="\${" end="}"	contains=@shDerefList,shDerefVarArray nextgroup=shSpecialStart
 syn match  shDerefSimple	"\$[-#*@!?]"	nextgroup=@shNoZSList
 syn match  shDerefSimple	"\$\$"	nextgroup=@shNoZSList
-syn match  shDerefSimple	"\${\d}"	nextgroup=@shNoZSList
+syn match  shDerefSimple	"\${\d}"	nextgroup=@shNoZSList	nextgroup=shSpecialStart
 if exists("b:is_bash") || exists("b:is_kornshell") || exists("b:is_posix")
- syn region shDeref	matchgroup=PreProc start="\${##\=" end="}"	contains=@shDerefList	nextgroup=@shSpecialNoZS
- syn region shDeref	matchgroup=PreProc start="\${\$\$" end="}"	contains=@shDerefList	nextgroup=@shSpecialNoZS
+ syn region shDeref	matchgroup=PreProc start="\${##\=" end="}"	contains=@shDerefList	nextgroup=@shSpecialNoZS,shSpecialStart
+ syn region shDeref	matchgroup=PreProc start="\${\$\$" end="}"	contains=@shDerefList	nextgroup=@shSpecialNoZS,shSpecialStart
 endif
 
 " ksh: ${!var[*]} array index list syntax: {{{1