- Speed up by making null/false/true reserved word which allows to drop

an opcode (FETCH_CONSTANT) for every usage.

Zend/zend_language_parser.y

@@ -142,6 +142,9 @@
 %token T_DOLLAR_OPEN_CURLY_BRACES
 %token T_CURLY_OPEN
 %token T_PAAMAYIM_NEKUDOTAYIM
+%token T_NULL
+%token T_FALSE
+%token T_TRUE
 
 %% /* Rules */
 
@@ -675,6 +678,9 @@ common_scalar:
 	|	T_CLASS_C					{ $$ = $1; }
 	|	T_METHOD_C					{ $$ = $1; }
 	|	T_FUNC_C					{ $$ = $1; }
+	|	T_NULL						{ $$ = $1; }
+	|	T_FALSE						{ $$ = $1; }
+	|	T_TRUE						{ $$ = $1; }
 ;
 
 

Zend/zend_language_scanner.l

@@ -57,6 +57,7 @@
 #include "zend_constants.h"
 #include "zend_variables.h"
 #include "zend_operators.h"
+#include "zend_API.h"
 
 #ifdef HAVE_STDARG_H
 # include <stdarg.h>
@@ -1303,6 +1304,21 @@ NEWLINE ("\r"|"\n"|"\r\n")
 	return T_FILE;
 }
 
+<ST_IN_SCRIPTING>"NULL" {
+	ZVAL_NULL(zendlval);
+	return T_NULL;
+}
+
+<ST_IN_SCRIPTING>"FALSE" {
+	ZVAL_FALSE(zendlval);
+	return T_FALSE;
+}
+
+<ST_IN_SCRIPTING>"TRUE" {
+	ZVAL_TRUE(zendlval);
+	return T_TRUE;
+}
+
 <INITIAL>(([^<]|"<"[^?%s<]){1,400})|"<s"|"<" {
 #ifdef ZEND_MULTIBYTE
 	if (SCNG(output_filter)) {