How Can I Preserve Keys While Merging Arrays in PHP?

Preserving Keys During Array Merging in PHP

Your code aims to merge two arrays, one with string-keyed pairs and the other with integer-keyed pairs, while preserving the original keys. The issue arises because the default array_merge() function reindexes the resulting array, losing the desired key structure.

Solution: Array Addition

To overcome this challenge, you can leverage the array addition ( ) operator in PHP. This operator concatenates arrays while maintaining their original keys. By adding the two arrays, you effectively merge them while respecting the string and integer keys.

Example Usage

Your provided code can be modified as follows:

$staticIdentifications = array(
    Users::userID => "USERID",
    Users::username => "USERNAME"
);
$companyVarIdentifications = CompanyVars::getIdentificationVarsFriendly($_SESSION['companyID']);
$idVars = $staticIdentifications + $companyVarIdentifications;

Now, the $idVars array will contain the merged elements, with the string keys from $staticIdentifications and the integer keys from $companyVarIdentifications.

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