From:
Operating system: Cent OS 5
PHP version: 5.2.13
Package: DOM XML related
Bug Type: Bug
Bug description:XPath returns inconsistent results
Description:
------------
Sometimes the DOMXpath->evaluate() function returns unreliable results.
This seems to happen when the document has at least a depth of 3 and
selectors are used at multiple levels. There may be other conditions that
trigger it; I'm not sure. The test script below is consistently showing
errors for me.
Test script:
---------------
<?php
$rawxml = '<?xml version="1.0"?><root><field attr1="val1"><field
attr1="val1"/></field></root>';
$rawxpath = "/root[1]/fie...@attr1='val1']";
$results = array();
for ($i = 0; $i < 10000; $i++) {
$xmlDocument = new DOMDocument();
$xmlDocument->loadXML($rawxml);
$xp = new DOMXPath($xmlDocument);
$xpr = $xp->evaluate($rawxpath, $xmlDocument->documentElement);
if (isset($results[(string) $xpr->length]))
$results[(string) $xpr->length]++;
else
$results[(string) $xpr->length] = 1;
}
foreach ($results as $matches => $count)
printf("In %5d instances, found $matches match(es) for
$rawxpath\n", $count);
Expected result:
----------------
In 10000 instances, found 1 match(es) for /root[1]/fie...@attr1='val1']
Actual result:
--------------
The exact numbers seem to vary, but I get roughly this response:
In 9924 instances, found 1 match(es) for /root[1]/fie...@attr1='val1']
In 76 instances, found 2 match(es) for /root[1]/fie...@attr1='val1']
--
Edit bug report at http://bugs.php.net/bug.php?id=52373&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=52373&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=52373&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=52373&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=52373&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=52373&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=52373&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=52373&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=52373&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=52373&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=52373&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=52373&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=52373&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=52373&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=52373&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52373&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=52373&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=52373&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=52373&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=52373&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=52373&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=52373&r=mysqlcfg
