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Bug #17343 Resource encapsulation can break some functions
Submitted: 2002-05-21 17:54 UTC Modified: 2002-06-17 16:24 UTC
From: chris at thumbtack dot org Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 4.2.1 OS: Linux
Private report: No CVE-ID: None
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 [2002-05-21 17:54 UTC] chris at thumbtack dot org 
When using mysql_insert_id() if you've made a call using a wrapped function (ie, my_database_query($query) wrapping mysql_query()) the database resource may not be "set" to allow using the last connection.

Ex.
1)  Call my_database_connect() and store the returned mysql Link as $res.  Note that it's a copy...
2)  call my_database_query($query, $res) and insert something with an auto_increment field.
3)  call mysql_insert_id() and it'll fail.
4)  call mysql_insert_id($res) and it'll work.

It appears that mysql_insert_id() looks for the last used connection, but if that connection resource is "wrapped/copied" then the ZEND_GET_RESOURCE-type method can't find it. 

Storing a REFERENCE to the mysql link in (1) will allow proper usage, but storing a copy does not.

This was exposed using mysql, but it may have deeper meaning to other modules - hence the "Unknown/Other Function" category

chris@thumbtack.org

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 [2002-05-21 17:56 UTC] szii at sziisoft dot com 
This used to work (calling against a copy of the link) in PHP 4.0pl1.

-Szii
 [2002-06-17 15:10 UTC] hholzgra@php.net 
resources are just numbers used to lookup
the actual resource data internaly, so
passing by value or reference should make no differecne ...
 [2002-06-17 16:24 UTC] sniper@php.net 
Not enough information was provided for us to be able
to handle this bug. Please re-read the instructions at
http://bugs.php.net/how-to-report.php

If you can provide more information, feel free to add it
to this bug and change the status back to "Open".

Thank you for your interest in PHP.
 
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