0

I have a very simple array like this:

Array ( [friend_id] => 180 [user_id] => 175 )

What I want to do is just to switch the values, in order to be come this:

Array ( [friend_id] => 175 [user_id] => 180 )

Is there any elegant NON STATIC way in PHP to do it?

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3
  • What do you mean by "non static"? Commented Jul 19, 2013 at 15:11
  • By non-static, do you mean that you always want the friend_id switched with the user_id? Commented Jul 19, 2013 at 15:11
  • No I mean that it can do the job without having to declare the indexes Commented Jul 19, 2013 at 15:11

5 Answers 5

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3

you can use array_combine and array_reverse

$swapped = array_combine(array_keys($arr), array_reverse(array_values($arr)));
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Comments

2

No. Use a temporary value:

$temp = $array['friend_id'];
$array['friend_id'] = $array['user_id'];
$array['user_id'] = $temp;
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3 Comments

Odd, imo this answer is as wrong as the one scoring -1, yet it gets 2 upvotes.
@fvu: uh, perhaps you should start looking at timestamps. at the time I posted this, the OP hadn't yet posted his "without indexes" comment.
I understand your reasoning, I was merely commenting on what I perceive as intriguing voting behavior.
0

A bit longish, but I think it satisfies you requirements for 2 element arrays, just as you used in your example:

// your input array = $yourarray;
$keyarray = array_keys($yourarray);
$valuearray = array_values($yourarray);
/// empty input array just to make sure
$yourarray = array();
$yourarray[$keyarray[0]] = $valuearray[1];
$yourarray[$keyarray[1]] = $valuearray[0];

Basically Orangepill's answer done manually...

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Comments

0

How about using array_flip?

array array_flip ( array $trans )

$myar = array('apples', 'oranges', 'pineaples');                                   print_r($myar);                                                                   
print_r(array_flip($myar));      
Array
(
    [0] => apples
    [1] => oranges
    [2] => pineaples
)
Array
(
    [apples] => 0
    [oranges] => 1
    [pineaples] => 2
)
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Comments

-1 
$tmp = $array['user_id'];
$array['user_id'] = $array['friend_id'];
$array['friend_id'] = $tmp;
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1 Comment

Not the downvoter, but in his clarification OP says you don't know the indexes. Your technique only works when the indexes are known.

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