zend_test: Backport zend_test_compile_to_ast() function

This was introduced in 8.5.
We need this in 8.4 too to debug AST dumping (see phpGH-24418).

Author: ndossche

ext/zend_test/test.c

@@ -1792,6 +1792,28 @@ static PHP_FUNCTION(zend_test_create_throwing_resource)
 	ZVAL_RES(return_value, res);
 }
 
+static PHP_FUNCTION(zend_test_compile_to_ast)
+{
+	zend_string *str;
+
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_STR(str)
+	ZEND_PARSE_PARAMETERS_END();
+
+	zend_arena *ast_arena;
+	zend_ast *ast = zend_compile_string_to_ast(str, &ast_arena, ZSTR_EMPTY_ALLOC());
+	if (!ast) {
+		RETURN_THROWS();
+	}
+
+	zend_string *result = zend_ast_export("", ast, "");
+
+	zend_ast_destroy(ast);
+	zend_arena_destroy(ast_arena);
+
+	RETVAL_STR(result);
+}
+
 static PHP_FUNCTION(zend_test_gh18756)
 {
 	ZEND_PARSE_PARAMETERS_NONE();

ext/zend_test/test.stub.php

@@ -330,6 +330,8 @@ function zend_test_is_zend_ptr(int $addr): bool {}
 
     function zend_test_log_err_debug(string $str): void {}
 
+    function zend_test_compile_to_ast(string $str): string {}
+
     function zend_test_gh18756(): void {}
 
     /** @compile-time-eval */