add php heredoc support

lib/ace/mode/php_highlight_rules.js

@@ -974,6 +974,16 @@ var PhpLangHighlightRules = function() {
                 // TODO: Unicode escape sequences
                 // TODO: Unicode identifiers
                 regex : "[a-zA-Z_$][a-zA-Z0-9_$]*\\b"
+            }, {
+                token : function(value, currentSate, state) {
+                    value = value.substr(3);
+                    if (value[0] == "'" || value[0] == '"')
+                        value = value.slice(1, -1);
+                    state.unshift(this.next, value);
+                    return "markup.list";
+                },
+                regex : /<<<(?:\w+|'\w+'|"\w+")$/,
+                next: "heredoc"
             }, {
                 token : "keyword.operator",
                 regex : "!|\\$|%|&|\\*|\\-\\-|\\-|\\+\\+|\\+|~|===|==|=|!=|!==|<=|>=|<<=|>>=|>>>=|<>|<|>|!|&&|\\|\\||\\?\\:|\\*=|%=|\\+=|\\-=|&=|\\^=|\\b(?:in|instanceof|new|delete|typeof|void)"
@@ -988,6 +998,22 @@ var PhpLangHighlightRules = function() {
                 regex : "\\s+"
             }
         ],
+        "heredoc" : [
+            {
+                token : function(value, currentSate, stack) {
+                    if (stack[1]  + ";" != value)
+                        return "string";
+                    stack.shift();
+                    stack.shift();
+                    return "markup.list"
+                },
+                regex : "^\\w+;$",
+                next: "start"
+            }, {
+                token: "string",
+                regex : ".*",
+            }
+        ],
         "comment" : [
             {
                 token : "comment", // closing comment