Add single quotes for consistency.

Author: Crell

Zend/zend_language_parser.y

@@ -237,7 +237,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %token T_COALESCE        "'??'"
 %token T_POW             "'**'"
 %token T_POW_EQUAL       "'**='"
-%token T_PIPE         "|>"
+%token T_PIPE         "'|>'"
 /* We need to split the & token in two to avoid a shift/reduce conflict. For T1&$v and T1&T2,
  * with only one token lookahead, bison does not know whether to reduce T1 as a complete type,
  * or shift to continue parsing an intersection type. */