php determine position of array key relative to another key

Question

I was wondering if it was possible to determine what position a key in an array is in relation to another key. I have a large multidimensional array and I need perform Function A when the key [E14_21] comes before [E14_20] and I need to perform a different Function B if not...

//perform Function A if:
[E14_20_0] => Array
    (
        [E14_21] => 3235
        [E14_20] => 96
    )
//Perform Function B if:
[E14_20_0] => Array
    (
        [E14_20] => 96
        [E14_21] => 3235
    )

I'm not sure that associative arrays are sequential, probably wrong though... — jondavidjohn
– jondavidjohn, Commented Mar 8, 2011 at 19:04

jcoby · Accepted Answer · 2011-03-08 19:25:06Z

2

You can do something like:

$keys = array_keys($E14_20_0);
if(array_search("E14_21", $keys) < array_search("E14_20", $keys)) {
  // function A
} else {
  // function B
}

You will of course need to add some sanity checks to make sure both keys exist in the array, etc.

answered Mar 8, 2011 at 19:25

jcoby

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Comments

Community · Accepted Answer · 2023-11-17 20:42:18Z

1

It seems you might do this:

reset($E14_20_0);
first = each($E14_20_0);
second = each($E14_20_0);

if(first['key'] > second['key'])
{
    //do something
}

This is very specific to your example, but it might help you get started.

reset() will reset the array pointer to the "first" element. each() returns the key and value of the array based on the pointer and advances the pointer. Then you can compare keys and perform your logic.

edited Nov 17, 2023 at 20:42

CommunityBot

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answered Mar 8, 2011 at 19:15

Surreal Dreams

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