how to append an array to another arrays in php -

how to append an array to another arrays in php -

i have arrays in script

$users = array("a", "b", "c", "d", "e"); $newusers = array("f", "g", "h", "i"); $totalusers = $users + $newusers;

by using union operator, tried append $newuser array $users.

and store in $totalusers, after printing $totalusers using print_r($totalusers).

it printed out $users array contents. why ?

i used array_merge($users + $newusers) , printed $users array contents.

finally using 1 of next methods,

method 1:

$totalusers = array_merge(array_values($users), array_values($newusers)); print_r($totalusers);

method 2:

array_merge($users, $newusers); print_r($totalusers);

i got right output

( [0] => [1] => b [2] => c [3] => d [4] => e [5] => f [6] => g [7] => h [8] => )

what problem, , different between above methods??

the + operator returns right-hand array appended left-hand array; keys exist in both arrays, elements left-hand array used, , matching elements right-hand array ignored.

http://www.php.net//manual/en/language.operators.array.php

in other words, adds elements right hand if keys don't exist in left hand array. explains why nil in case.

array_merge($users + $newusers)

this same, array union, , afterwards array_merge on result. nil either.

array_merge($users, $newusers)

this want, it's right thing do.

array_merge(array_values($users), array_values($newusers))

this exact same thing well, array_values nil in case.

php