#25687 [Ver->Bgs]: "Segmentation fault" - trying to inherit >2 classes and to call parent constr.
| From: | moriyoshi@php.net | Date: | Thu, 02 Oct 2003 21:04:55 +0000 |
| Subject: | #25687 [Ver->Bgs]: "Segmentation fault" - trying to inherit >2 classes and to call parent constr. | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-48460@lists.php.net to get a copy of this message | ||
ID: 25687
Updated by: moriyoshi@php.net
Reported By: kostyal at realeastnetworks dot com
-Status: Verified
+Status: Bogus
Bug Type: Class/Object related
Operating System: *
PHP Version: 5CVS, 4CVS
New Comment:
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
get_parent_class($instance) returns the parent class name of the
specified instance. Thus, whatever call_constr() is invoked from,
get_parent_class() always returns the same value since the actual class
of $this is TwinBarChart, and this leads call_constr() into an infinite
recursion which finally causes segmentation fault.
As an alternative solution, you can do it like the following:
<?php
class object {
function call_constr($class) {
$par = get_parent_class($class);
$this->$par();
}
}
class Graph extends object {
function Graph() {
}
}
class TwinGraph extends Graph {
function TwinGraph() {
$this->call_constr(__CLASS__);
}
}
class TwinBarChart extends TwinGraph {
function TwinBarChart() {
$this->call_constr(__CLASS__);
echo "Test";
}
}
?>
Previous Comments:
------------------------------------------------------------------------
[2003-09-29 05:20:59] kostyal at realeastnetworks dot com
Description:
------------
Description:
Segmentation fault occurs when trying to inherit more then two classes
and to call parent constructors (see example to understand how I'm
trying to do it).
When I comment last "call_constr()" call, the problem disappears.
Configure Command:
'../configure' '--prefix=/usr' '--with-apxs=/usr/bin/apxs'
'--with-regex=php' '--with-config-file-path=/etc/php4/apache'
'--disable-rpath' '--disable-debug' '--enable-memory-limit'
'--with-layout=GNU' '--with-pear=/usr/share/php' '--enable-calendar'
'--enable-sysvsem' '--enable-sysvshm' '--enable-track-vars'
'--enable-trans-sid' '--enable-bcmath' '--with-bz2'
'--enable-ctype'
'--with-db4' '--with-iconv' '--enable-exif'
'--enable-filepro'
'--enable-ftp' '--with-gettext' '--enable-mbstring'
'--with-pcre-regex=/usr' '--enable-shmop' '--enable-sockets'
'--enable-wddx' '--disable-xml' '--with-expat-dir=/usr'
'--enable-yp'
'--with-zlib' '--without-pgsql' '--with-kerberos=/usr'
'--with-openssl=/usr' '--with-exec-dir=/usr/lib/php4/libexec'
'--disable-static' '--with-curl=shared,/usr' '--with-dom=shared,/usr'
'--with-dom-xslt=shared,/usr' '--with-dom-exslt=shared,/usr'
'--with-zlib-dir=/usr' '--with-gd=shared,/usr'
'--with-jpeg-dir=shared,/usr' '--with-xpm-dir=shared,/usr/X11R6'
'--with-png-dir=shared,/usr' '--with-freetype-dir=shared,/usr'
'--with-imap=shared,/usr' '--with-imap-ssl' '--with-ldap=shared,/usr'
'--with-mcal=shared,/usr' '--with-mhash=shared,/usr' '--with-mm'
'--with-mysql=shared,/usr' '--with-unixODBC=shared,/usr'
'--with-recode=shared,/usr' '--enable-xslt=shared'
'--with-xslt-sablot=shared,/usr' '--with-snmp=shared'
'--enable-ucd-snmp-hack' '--with-sybase-ct=shared,/usr'
'--with-ttf=shared,/usr' '--with-t1lib=shared,/usr'
Reproduce code:
---------------
class object {
function call_constr() {
$par=get_parent_class($this);
$this->$par();
}
}
class Graph extends object {
function Graph() {
}
}
class TwinGraph extends Graph {
function TwinGraph() {
$this->call_constr(); // calling parent constructor
}
}
class TwinBarChart extends TwinGraph {
function TwinBarChart() {
$this->call_constr(); // calling parent constructor
echo "Test";
}
}
$graph=new TwinBarChart();
Expected result:
----------------
Test
Actual result:
--------------
Segmentation fault
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=25687&edit=1