Bug #62497 [NEW]: array_intersect doesn't work properly when data is reversed with duplicates

From: martin at psinas dot com Operating system: Linux PHP version: 5.4.4 Package: Arrays related Bug Type: Bug Bug description:array_intersect doesn't work properly when data is reversed with duplicates Description: ------------ As mentioned here: http://us3.php.net/manual/en/function.array-intersect.php#92900 array_intersect doesn't work properly when data is reversed with duplicates Test script: --------------- <?php $text1 = "one two two"; $text2 = "one two three"; $old = explode(' ', $text1); $new = explode(' ', $text2); $preserved1 = array_intersect($old, $new); $deleted = array_diff($old, $preserved1); $preserved2 = array_intersect($new, $old); $inserted = array_diff($new, $preserved2); echo '<pre>'; print_r($preserved1); print_r($deleted); print_r($preserved2); print_r($inserted); echo '<pre>'; ?> Expected result: ---------------- Array ( [0] => one [1] => two ) Array ( [2] => three ) Array ( [0] => one [1] => two ) Array ( [2] => three ) Actual result: -------------- Array ( [0] => one [1] => two [2] => two ) Array ( ) Array ( [0] => one [1] => two ) Array ( [2] => three ) -- Edit bug report at https://bugs.php.net/bug.php?id=62497&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=62497&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=62497&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=62497&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=62497&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=62497&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=62497&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=62497&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=62497&r=needscript Try newer version: https://bugs.php.net/fix.php?id=62497&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=62497&r=support Expected behavior: https://bugs.php.net/fix.php?id=62497&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=62497&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=62497&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=62497&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=62497&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=62497&r=dst IIS Stability: https://bugs.php.net/fix.php?id=62497&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=62497&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=62497&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=62497&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=62497&r=mysqlcfg