diff --git a/syntax_files/php.yaml b/syntax_files/php.yaml
index a5ab9ea..9f9742b 100644
--- a/syntax_files/php.yaml
+++ b/syntax_files/php.yaml
@@ -28,7 +28,7 @@ rules:
     - statement: "(^|[[:space:]])(implements|abstract|instanceof|if|else(if)?|endif|namespace|use|as|new|throw|catch|try|while|print|for|(end)?(foreach)?)\\b"
     - identifier: "new\\s([a-zA-Z0-9\\\\]+)"
     - special: "(break|continue|goto|return)"
-    - constant.bool: "(=|[[:space:]])(true|false|null|TRUE|FALSE|NULL)"
+    - constant.bool: "(\\:|\\?|=|[[:space:]])(true|false|null|TRUE|FALSE|NULL)"
     - constant: "[\\s|=|\\s|\\(|/|+|-|\\*|\\[]"
     - constant.number: "[0-9]"
     - identifier: "(\\$this|parent|self|\\$this->)"