Req #70523 [NEW]: check xpath expression

From: kakkau at grr dot la Operating system: any PHP version: 5.6.13 Package: DOM XML related Bug Type: Feature/Change Request Bug description:check xpath expression Description: ------------ --- From manual page: http://www.php.net/class.domxpath --- in some cases the return value of DOMXPath::evaluate could be unfavorable. For example what if a valid xpath expression like 'false()' or 'count(...)=0' evaluates to false and you want to catch e.g. malformed xpath expressions which return false as well? how to distinguish those scenarios? therefor it would be useful to have a function to - check the xpath expression first or - having some kind of unique value returned in case the evaluation failed Test script: --------------- <?php $d = new DOMDocument(); $xs = '<?xml version="1.0" ?><root><foo /></root>'; $d->loadXML($xs); $x = new DOMXPath($d); // simple eval $eval = $x->evaluate('false()'); if(!$eval) { echo "BOOBOO"; } // complex but valid eval $eval = $x->evaluate('count(//foo)=0'); if(!$eval) { echo "BOOBOO"; } // bad eval $eval = $x->evaluate(')'); if(!$eval) { echo "BOOBOO"; } ?> -- Edit bug report at https://bugs.php.net/bug.php?id=70523&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70523&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70523&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70523&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70523&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70523&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70523&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70523&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70523&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70523&r=support Expected behavior: https://bugs.php.net/fix.php?id=70523&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70523&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70523&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70523&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70523&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70523&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70523&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70523&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70523&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70523&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70523&r=mysqlcfg