3

For example i have an array with the element of following 

$array = array(
               1 => "a",
               3 => "c",
               4 => "d",
               6 => "f",
              );

how could i get next key from given key, if I'm using some function like 

get_next_key_array($array,1);
it should return 3.

if it be 

 get_next_key_array($array,4);
 it should return 6.

Is it can be done, I know that next(),current(),prev() in php, but i don't know how to implement my required result using default functions. Please help me.

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4 Answers 4

Reset to default
13

Try this out

function get_next_key_array($array,$key){
    $keys = array_keys($array);
    $position = array_search($key, $keys);
    if (isset($keys[$position + 1])) {
        $nextKey = $keys[$position + 1];
    }
    return $nextKey;
}
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2 Comments

This one is still a lifesaver and a keeper. Add '- 1' into a new function and you have all your prev-next-buttons working on every array you can come up with.
A good IDE will inform you that $nextKey might not be declared at the return line. Maybe it should be return $keys[$position + 1] ?? null; instead of the if+return. This answer is missing its educational explanation.
2 
function get_next_key_array( $array, $find_key ) {
    $flag = false;
    foreach( $array as $key => $value ) {
        if( $flag ) {
            return $key;
        }
        if( $key === $find_key ) {
            $flag = true;
        }
    }
    return false;
}
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1 Comment

This answer is missing its educational explanation.
0

try this:

$len = count($array);
$keys = array_keys($array);
$keys_map = array_flip($keys);
if($keys_map[$current_key]>=$len-1)
    $nextkey = $keys[0];
else
    $nextkey = $keys[$keys_map[$current_key]];
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1 Comment

This answer is missing its educational explanation.
0

This is done for normal case:

function get_next_key_array(&$array, $key)
{
    while (key($array) !== $key) {
        next($array);
    }
    next($array);

    return key($array);
}
$array = array(
    1 => 'a',
    3 => 'c',
    4 => 'd',
    6 => 'f',
);
$key = 4;
echo get_next_key_array($array, $key);

DEMO

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2 Comments

Note that if the key is not detected, you go in an infinite loop.
This answer is missing its educational explanation.

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