array_key_exists表示数组中的复合键

Question

How do I check to see if a compound key exists with array_key_exists such as

$myarr['ind1']['ind2']

Would like to see if the key ['ind1']['ind2'] exists in $myarr.

I googled this and looked at some similar answers but couldn't find anything.

Answer 1

You can make use of isset^Docs to check for an array member that not equals NULL, which is the case for a compound array and safe to assume in your case:

if (isset($myarr['ind1']) && array_key_exists('ind2', $myarr['ind1'])
{
   ...
}

If $myarr['ind2'] potentially never equals to NULL you can do the following, which might show better what you're trying to check:

if (isset($myarr['ind1']['ind2']))
{
   ...
}

This checks the compound key does exists and is not NULL.