fix glayzzle#36

Author: ichiriac

src/parser/expr.js

@@ -65,6 +65,11 @@ module.exports = {
    */
   ,read_expr_item: function() {
 
+    if (this.token === this.tok.T_STRING) {
+      var tokTxt = this.text();
+      if (tokTxt === 'b' || tokTxt === 'B') this.token = this.tok.T_STRING_CAST;
+    }
+
     switch(this.token) {
 
       case '@':