note 61558 deleted from function.array-flip by danbrown

Note Submitter: mikeb at tracersinfo dot com ---- Further deriving on benles -> crescentfreshpot, I think the following restatement of array_invert() reads much easier and probably runs faster, too. It does yield the same results: function array_invert($arr) { $flipped = array(); foreach ( $arr as $k => $a ) { # put the value in the key, with a throw-away value. dups are inherently avoided, # though overwritten. not sure if prefixing with if ( !isset($flipped[$a][$k]) ) # would speed this up or slow it down. probably depends on quantity of dups. $flipped[$a][$k] = NULL; } foreach ( $flipped as $k => $fl ) { # now make the keys the values. $flipped[$k] = array_keys($fl); } return $flipped; }