Bug #52373 [NEW]: XPath returns inconsistent results

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]/field[@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]/field[@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]/field[@attr1='val1'] In 76 instances, found 2 match(es) for /root[1]/field[@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