Bug #14221 Updated: Segmentation fault when using class that accesses member functions & variables.

ID: 14221 Updated by: yohgaki Reported By: nickj@nickj.org Old Status: Open Status: Duplicate Bug Type: Scripting Engine problem Operating System: Linux Mandrake 7.2 PHP Version: 4.0.4pl1 New Comment: Make this report a duplicate of #13703 Previous Comments: ------------------------------------------------------------------------ [2001-11-26 04:01:48] nickj@nickj.org > php doesn't call functions based on the parameters given Ah hah! OK, that changes everything - I was thinking like C++ classes, which, if my memory serves me correctly, know which member function to use. Modified code that deals with this OK: ======================================================== #!/usr/bin/php -q <?php error_reporting (E_ALL); class test { var $currentField; function setCurrentField($field_name) { $this->currentField = $field_name; } function getValue($field_name = false) { if ($field_name === false) $field_name = $this->currentField; return "getValue with arg - $field_name\n"; } } $frm = new test; $frm->setCurrentField("blah"); print $frm->getValue("real arg"); print $frm->getValue(); ?> ======================================================== > That's an ZE problem (ie. > method with same name should give parse error or at least some > warning). Agreed. Testing this with straight functions shows that the engine does do this for straight functions: ======================================================== #!/usr/bin/php -q <?php error_reporting (E_ALL); function blah() { print "no arg\n"; } function blah($field) { print "with arg, $field\n"; } blah(); blah("test"); ?> ======================================================== Output gives: [root tmp]# ./test.php <br> <b>Fatal error</b>: Cannot redeclare blah() in <b>./test.php</b> on line <b>9</b><br> [root tmp]# An equivalent "Cannot redeclare test class member function blah() in test.php on line 9" would be extremely helpful and is probably called for - I've always found the PHP syntax checking to extremely clear and spot-on previously. Many thanks for all your help, Kind Regards, Nick. ------------------------------------------------------------------------ [2001-11-26 03:05:16] mfischer@php.net Your code is obviously bogus. You're definig two methods with the same name. But I admit this shouldn't be possible, derick? Anyway, because of this the second getValue() overwrites the former and therefore you have an infinite look; getValue calls getValue calls getValue calls ... That's an ZE problem (ie. method with same name should give parse error or at least some warning). (Correct if otherwise) ps: php doesn't call funtions based on the parameters given ------------------------------------------------------------------------ [2001-11-26 02:46:22] derick@php.net Can you try the latest RC from : www.php.net/~zeev/php-4.1.0RC3.tar.gz ? Derick ------------------------------------------------------------------------ [2001-11-26 02:22:07] nickj@nickj.org The problem: Segmentation fault when using class that accesses member functions & variables. A short script that reproduces the problem: [note, this is a command line script, but an equivalent web script doesn't work either] ======================================================== #!/usr/bin/php -q <?php error_reporting (E_ALL); class test { var $currentField; function setCurrentField($field_name) { $this->currentField = $field_name; } function getValue($field_name) { return "getValue with arg - $field_name\n"; } function getValue() { return $this->getValue($this->currentField); } } $frm = new test; $frm->setCurrentField("blah"); print $frm->getValue(); ?> ======================================================== What happens: [root tmp]# ./file.php Segmentation fault (core dumped) [root tmp]# What I would expect to happen: [root tmp]# ./file.php getValue with arg - blah [root tmp]# ============================================ Extra info about the setup being used: O/S is Linux Mandrake 7.2 with the shipped Linux 2.2.17 kernel, and the installed PHP uses updated RPMs that are available from the distribution's web site. Excerpts from phpinfo() shows: PHP Version 4.0.4pl1 Configure Command './configure' '--with-apxs=/usr/sbin/apxs' '--without-mysql' '--disable-static' '--disable-debug' '--enable-pic' '--enable-inline-optimization' '--prefix=/usr' '--with-zlib' '--with-config-file-path=/etc' '--enable-magic-quotes' '--enable-debugger' '--enable-track-vars' '--enable-safe-mode' '--with-exec-dir=/usr/bin' '--with-regex=system' '--with-versioning' '--enable-dba=shared' '--with-gdbm' '--with-db2' '--enable-sysvsem' '--enable-sysvshm' '--with-mod_charset' '--enable-force-cgi-redirect' '--with-mm' '--enable-trans-sid' '--with-dbase' '--with-filepro' '--enable-yp' '--enable-ftp' '--with-xml' '--with-gettext' Server API Apache Virtual Directory Support disabled Configuration File (php.ini) Path /etc ZEND_DEBUG disabled Thread Safety disabled This program makes use of the Zend scripting language engine: Zend Engine v1.0.4, Copyright (c) 1998-2000 Zend Technologies with Zend Optimizer v1.1.0, Copyright (c) 1998-2000, by Zend Technologies ============================================= Any extra info that I can provide that would help, please just let me know. Kind Regards, Nick. ------------------------------------------------------------------------ Edit this bug report at http://bugs.php.net/?id=14221&edit=1