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Bug #44542 __tostring does not work when using it for calling a function
Submitted: 2008-03-26 22:24 UTC Modified: 2008-07-17 23:13 UTC
Votes:2
Avg. Score:4.0 ± 1.0
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:1 (50.0%)
From: account at dds dot nl Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.2.5 OS: Windows Vista
Private report: No CVE-ID: None
 [2008-03-26 22:24 UTC] account at dds dot nl
Description:
------------
When I try to use __tostring to call a function I get an error that 'the function name must be a string'. While calling a class member with __tostring does work.

--Steven

Reproduce code:
---------------
<?php
    class test {
        public $string = 'Class member named `string`.';

        public function __tostring() {
            return 'string';
        }

        public function string() {
            return "This is a string from a function.";
        }
    }
    $test = new test();
    $function_name = 'string';
    print $test."\n";
    print $test->$test."\n";
    print $test->$function_name()."\n";
    print $test->$test()."\n";
?>

Expected result:
----------------
---------- PHP ----------
string
Class member named `string`.
This is a string from a function.
This is a string from a function.

Output completed (0 sec consumed)

Actual result:
--------------
---------- PHP ----------
string
Class member named `string`.
This is a string from a function.

Fatal error: Method name must be a string in C:\projects\test.php on line 18

Output completed (0 sec consumed)

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 [2008-03-30 16:02 UTC] php at xuefeng dot org
try this patch. 

Index: zend_vm_execute.h
===================================================================
RCS file: /repository/ZendEngine2/zend_vm_execute.h,v
retrieving revision 1.62.2.30.2.49.2.45
diff -u -r1.62.2.30.2.49.2.45 zend_vm_execute.h
--- zend_vm_execute.h	28 Mar 2008 14:34:59 -0000	1.62.2.30.2.49.2.45
+++ zend_vm_execute.h	30 Mar 2008 15:54:50 -0000
@@ -28885,6 +28885,7 @@
 {
 	zend_op *opline = EX(opline);
 	zval *function_name;
+	zval *name_is_object_method;
 	char *function_name_strval;
 	int function_name_strlen;
 
@@ -28893,6 +28894,13 @@
 
 	function_name = _get_zval_ptr_cv(&opline->op2, EX(Ts), BP_VAR_R TSRMLS_CC);
 
+	if (Z_TYPE_P(function_name) == IS_OBJECT && Z_OBJ_HT_P(function_name)->get_method != NULL) {
+		ALLOC_INIT_ZVAL(name_is_object_method);
+		if (zend_std_cast_object_tostring(function_name, name_is_object_method, IS_STRING TSRMLS_CC) == SUCCESS) {
+			function_name = name_is_object_method;
+		}
+	}
+
 	if (Z_TYPE_P(function_name)!=IS_STRING) {
 		zend_error_noreturn(E_ERROR, "Method name must be a string");
 	}
 [2008-04-01 21:38 UTC] felipe@php.net
This seems expected, as an object also isn't converted when passed on array key. (i.e. $arr[$obj]) and any other cases.
 [2008-07-17 23:13 UTC] jani@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php


 
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