php
diff --git a/‎Zend/zend_ast.h‎
Lines changed: 1 addition & 0 deletions b/‎Zend/zend_ast.h‎
Lines changed: 1 addition & 0 deletions
diff --git a/‎Zend/zend_compile.c‎
Lines changed: 27 additions & 0 deletions b/‎Zend/zend_compile.c‎
Lines changed: 27 additions & 0 deletions
diff --git a/‎Zend/zend_language_parser.y‎
Lines changed: 4 additions & 0 deletions b/‎Zend/zend_language_parser.y‎
Lines changed: 4 additions & 0 deletions
@@ -115,6 +115,7 @@ enum _zend_ast_kind {
 	ZEND_AST_NEW,
 	ZEND_AST_INSTANCEOF,
 	ZEND_AST_YIELD,
+	ZEND_AST_COALESCE,
 
 	ZEND_AST_STATIC,
 	ZEND_AST_WHILE,
 
@@ -5324,6 +5324,30 @@ void zend_compile_conditional(znode *result, zend_ast *ast TSRMLS_DC) /* {{{ */
 }
 /* }}} */
 
+void zend_compile_coalesce(znode *result, zend_ast *ast TSRMLS_DC) /* {{{ */
+{
+	zend_ast *expr_ast = ast->child[0];
+	zend_ast *default_ast = ast->child[1];
+
+	znode expr_node, default_node;
+	zend_op *opline;
+	uint32_t opnum;
+
+	zend_compile_var(&expr_node, expr_ast, BP_VAR_IS TSRMLS_CC);
+
+	opnum = get_next_op_number(CG(active_op_array));
+	zend_emit_op(result, ZEND_COALESCE, &expr_node, NULL TSRMLS_CC);
+
+	zend_compile_expr(&default_node, default_ast TSRMLS_CC);
+
+	opline = zend_emit_op(NULL, ZEND_QM_ASSIGN, &default_node, NULL TSRMLS_CC);
+	SET_NODE(opline->result, result);
+
+	opline = &CG(active_op_array)->opcodes[opnum];
+	opline->op2.opline_num = get_next_op_number(CG(active_op_array));
+}
+/* }}} */
+
 void zend_compile_print(znode *result, zend_ast *ast TSRMLS_DC) /* {{{ */
 {
 	zend_ast *expr_ast = ast->child[0];
@@ -6158,6 +6182,9 @@ void zend_compile_expr(znode *result, zend_ast *ast TSRMLS_DC) /* {{{ */
 		case ZEND_AST_CONDITIONAL:
 			zend_compile_conditional(result, ast TSRMLS_CC);
 			return;
+		case ZEND_AST_COALESCE:
+			zend_compile_coalesce(result, ast TSRMLS_CC);
+			return;
 		case ZEND_AST_PRINT:
 			zend_compile_print(result, ast TSRMLS_CC);
 			return;
 
@@ -67,6 +67,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %right T_YIELD
 %left '=' T_PLUS_EQUAL T_MINUS_EQUAL T_MUL_EQUAL T_DIV_EQUAL T_CONCAT_EQUAL T_MOD_EQUAL T_AND_EQUAL T_OR_EQUAL T_XOR_EQUAL T_SL_EQUAL T_SR_EQUAL T_POW_EQUAL
 %left '?' ':'
+%right T_COALESCE
 %left T_BOOLEAN_OR
 %left T_BOOLEAN_AND 
 %left '|'
@@ -221,6 +222,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %token T_NS_C            "__NAMESPACE__ (T_NS_C)"
 %token T_NS_SEPARATOR    "\\ (T_NS_SEPARATOR)"
 %token T_ELLIPSIS        "... (T_ELLIPSIS)"
+%token T_COALESCE        "?? (T_COALESCE)"
 %token T_POW             "** (T_POW)"
 %token T_POW_EQUAL       "**= (T_POW_EQUAL)"
 
@@ -827,6 +829,8 @@ expr_without_variable:
 			{ $$ = zend_ast_create(ZEND_AST_CONDITIONAL, $1, $3, $5); }
 	|	expr '?' ':' expr
 			{ $$ = zend_ast_create(ZEND_AST_CONDITIONAL, $1, NULL, $4); }
+	|	expr T_COALESCE expr
+			{ $$ = zend_ast_create(ZEND_AST_COALESCE, $1, $3); }
 	|	internal_functions_in_yacc { $$ = $1; }
 	|	T_INT_CAST expr		{ $$ = zend_ast_create_cast(IS_LONG, $2); }
 	|	T_DOUBLE_CAST expr	{ $$ = zend_ast_create_cast(IS_DOUBLE, $2); }