ID: 11321
Comment by: jnicoll at seemysites dot net
Reported By: olivier at lx dot student dot wau dot nl
Status: No Feedback
Bug Type: XML related
Operating System: Linux
PHP Version: 4.0.5
New Comment:
I have also experienced this problem (or a similar problem) with PHP4's
native XML DOM techniques. Also happens on DOM n PHP5. I am running
PHP4 on my web server (Linux, don't know which version) and on my test
machine (Mac OS X 10.4.8) Every process I try chokes on Clickbank's
6MB XML file and only outputs garbage data. PHP5's SimpleXML seems to
work well.
Previous Comments:
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[2002-02-27 00:00:02] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a month, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
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[2002-01-14 09:59:20] [EMAIL PROTECTED]
Is this reproducable on 4.1.1?
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[2001-06-06 16:18:52] olivier at lx dot student dot wau dot nl
When parsing large XML files the PHP module starts corrupting memory.
In large applications this may result in a segfault, in this example
application it results in corruption of the xml parser itself (at least
on my test machines).
The code below is tested on three different servers, 2 of them running
Debian/Stable (Potato) with a custom compiled PHP 4.0.5, one server
running Debian/Unstable (Sid) with the Debian default PHP module (also
4.0.5). All run PHP as Apache module.
The custom build modules are build like this:
./configure --with-apxs=/usr/bin/apxs --with-mysql=/usr
--with-config-file-path=/etc/php4/apache --with-interbase=shared
--with-gnu-ld --with-xml --with-gd=shared
When using a small XML file, the code below runs fine, but when the XML
file gets bigger PHP starts complaining Unable to call handler
end_tag_handler() , Unable to call handler data_handler() or Unable to
call handler start_tag_handler().
The code:
<?php
class properties {
var $parser;
}
class my_class {
var $mydata;
var $mystarttag;
var $myendtag;
function my_class(&$props) {
xml_set_object($props->parser,&$this);
xml_set_element_handler($props->parser, 'start_tag_handler',
'end_tag_handler');
xml_set_character_data_handler($props->parser, 'data_handler');
}
function data_handler($parser, $data) {
$this->mydata .= $data;
}
function start_tag_handler($parser, $name, $attrs) {
$this->mystarttag .= $name;
}
function end_tag_handler($parser, $name) {
$this->myendtag .= $name;
echo 'end tag is '.$name.'<br>';
}
}
function first_element_handler($parser, $name, $attrs) {
global $props;
if ($name == 'QUESTION') {
/* normally I decide here, depending on $attrs what
kind of object I should create. For debugging purposes
I use just one object. */
$q_obj = new my_class($props);
} else {
die('This XML file has an unknown content');
}
}
function start_parsing($file) {
global $props;
$props = new properties();
$props->parser = xml_parser_create();
xml_parser_set_option($props->parser, XML_OPTION_CASE_FOLDING, TRUE);
xml_set_element_handler($props->parser, 'first_element_handler', '');
if (!($fp = fopen($file, "r"))) {
die("could not open XML input");
}
while ($data = fread($fp, 4096)) {
if (!xml_parse($props->parser, $data, feof($fp))) {
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($props->parser)),
xml_get_current_line_number($props->parser)));
}
}
xml_parser_free($props->parser);
}
echo 'start parsing';
start_parsing('val1.xml');
echo 'finished parsing';
?>
The XML file looks like this, but to see the problems the part between
<question> and </question> should be four times bigger:
<question type="VALUE">
<title>Fermentor size</title>
<hint>4032 hours a year, makes 96 runs a year. How many kg per cubic
meter per year do you produce?</hint>
<hint>That is 10 X 96 = 960 kg per cubic meter per year</hint>
<hint>You need 10.000 kg, so you need 10.4 cubic meter
production</hint>
<hint>You can't fill the reactor 100%, so let's assume 12 cubic meter
will do</hint>
<range correct="1">
<minval>11</minval>
<maxval>15</maxval>
<feedback>Very good! <b>Assuming</b> you can fill a
reactor....</feedback>
</range>
<range correct="0">
<minval>1</minval>
<maxval>11</maxval>
<feedback>Sorry, try again</feedback>
</range>
</question>
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Edit this bug report at http://bugs.php.net/?id=11321&edit=1
