diff --git a/autoload/acp.vim b/autoload/acp.vim
index 827bbcc..f140cb2 100644
--- a/autoload/acp.vim
+++ b/autoload/acp.vim
@@ -146,6 +146,13 @@ function acp#meetsForHtmlOmni(context)
         \              g:acp_behaviorHtmlOmniLength . ',}$'
 endfunction
 
+"
+function acp#meetsForPhpOmni(context)
+  return g:acp_behaviorPhpOmniLength >= 0 &&
+        \ a:context =~ '\k\{' .
+        \              g:acp_behaviorPhpOmniLength . ',}$'
+endfunction
+
 "
 function acp#meetsForCssOmni(context)
   if g:acp_behaviorCssOmniPropertyLength >= 0 &&
diff --git a/plugin/acp.vim b/plugin/acp.vim
index 0c01a31..52e6442 100644
--- a/plugin/acp.vim
+++ b/plugin/acp.vim
@@ -33,6 +33,7 @@ function s:makeDefaultBehavior()
         \   'perl'   : [],
         \   'xml'    : [],
         \   'html'   : [],
+        \   'php'    : [],
         \   'xhtml'  : [],
         \   'css'    : [],
         \ }
@@ -105,6 +106,12 @@ function s:makeDefaultBehavior()
         \   'repeat'  : 1,
         \ })
   "---------------------------------------------------------------------------
+  call add(behavs.php, {
+        \   'command' : "\<C-x>\<C-o>",
+        \   'meets'   : 'acp#meetsForPhpOmni',
+        \   'repeat'  : 1,
+        \ })
+  "---------------------------------------------------------------------------
   call add(behavs.xhtml, {
         \   'command' : "\<C-x>\<C-o>",
         \   'meets'   : 'acp#meetsForHtmlOmni',
@@ -143,6 +150,7 @@ call s:defineOption('g:acp_behaviorPythonOmniLength', 0)
 call s:defineOption('g:acp_behaviorPerlOmniLength', -1)
 call s:defineOption('g:acp_behaviorXmlOmniLength', 0)
 call s:defineOption('g:acp_behaviorHtmlOmniLength', 0)
+call s:defineOption('g:acp_behaviorPhpOmniLength', 2)
 call s:defineOption('g:acp_behaviorCssOmniPropertyLength', 1)
 call s:defineOption('g:acp_behaviorCssOmniValueLength', 0)
 call s:defineOption('g:acp_behavior', {})