Req #55505 [NEW]: Request for array subtraction operator.

From: Operating system: PHP version: 5.3.8 Package: Arrays related Bug Type: Feature/Change Request Bug description:Request for array subtraction operator. Description: ------------ The manual page http://www.php.net/manual/en/language.operators.array.php describes several operators available which work on array variables. This includes the addition (+) operator, which allows us to merge two arrays. I would suggest that a subtraction operator would also be useful. For example, let us say we have two arrays, one of which is a full list of available items, and the other is a list of items which have been used, and I want to find the list of items which haven't been used. An array subtraction operator would help with this. Test script: --------------- <?php //suggested use for array subtraction operator. $full_list = array('de'=>'some data', 'gr'=>'some data', 'tt'=>'some data'); //etc... $used_list = array('gr'=>'some data'); //etc... $unused_list = $full_list - $used_list; //would contain 'de' and 'tt', but not 'gr'. ?> Expected result: ---------------- $unused_list would contain the array elements from $full_list minus those present in $used_list. In the example code, this would mean $unused_list would contain 'de' and 'tt', but not 'gr'. Actual result: -------------- This is a feature suggestion, so the above code does not currently run. -- Edit bug report at https://bugs.php.net/bug.php?id=55505&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=55505&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=55505&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=55505&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=55505&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=55505&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=55505&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=55505&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=55505&r=needscript Try newer version: https://bugs.php.net/fix.php?id=55505&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=55505&r=support Expected behavior: https://bugs.php.net/fix.php?id=55505&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=55505&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=55505&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=55505&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=55505&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=55505&r=dst IIS Stability: https://bugs.php.net/fix.php?id=55505&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=55505&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=55505&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=55505&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=55505&r=mysqlcfg