apply a user function to all KEYS in a 2d array

scrupul0us

I'm working with SNMP results and a bunch of the tables that come back don't have simple numeric indexes, they have MIB/OID references:

Array
(
    [IF-MIB::ifAlias.1] =>  description 1
    [IF-MIB::ifAlias.2] =>  description 2
    [IF-MIB::ifAlias.3] =>  description 3
    [IF-MIB::ifAlias.4] =>  description 4 
...
)

..now I already have a function using array_walk_recursive to strip all the value types from the element values but I'm seeing no way to easily strip the key names to just their numbers

again, I'm sure a loop could do this, but if there's a function for values, I'd hope there's be one for keys

thanks

dagon

how about array_flip() before an array_walk()

scrupul0us

i see where you are going with this... array_flip to edit the keys (now values) then array_flip back...

that's twice you've had my back this weekend dagon... I do believe I owe you a beer!

dagon

Just make suer both keys and values are unique, or you will be in trouble. And i prefer wine :-)

scrupul0us

found a hitch... if the interfaces doesnt have an alias then the value is blank and when you flip it the whole key/value pair goes bye-bye

this isn't necessarily a bad thing... just adds a little unexpected complexity =)

dagon

if you don't need the empties removing them is easy

array_filter($array);

bradgrafelman

$test = array('IF-MIB::ifAlias.1' => 'desc 1', 'IF-MIB::ifAlias.2' => 'desc 2');

$new = array_combine(array_map(function($key) { return (int)strrev($key); }, array_keys($test)), array_values($test));

Weedpacket

bradgrafelman wrote:
{ return (int)strrev($key); }

Assuming there can't be as many as 10 aliases.

return substr(strrchr($key, '.'), 1);

bradgrafelman

Forgot about that; I was going to reverse it again to get the right number, but your solution makes much more sense (as usual). :p