How to Merge PHP Arrays while Preserving Keys?

How to Merge PHP Arrays with Key Preservation

In PHP, merging two arrays with string and integer keys using array_merge() can result in re-indexing. For scenarios where key preservation is essential, an alternative approach is available.

Solution: Using Array Addition

Instead of array_merge(), use the array addition operator ( ) to combine arrays. This operator appends the elements of the second array to the first array without modifying the keys.

Consider the following example:

// Static array with string keys
$staticIdentifications = array(
    Users::userID => "USERID",
    Users::username => "USERNAME"
);

// Dynamic array with integer keys
$companyVarIdentifications = CompanyVars::getIdentificationVarsFriendly($_SESSION['companyID']);

// Merge arrays while preserving keys
$idVars = $staticIdentifications + $companyVarIdentifications;

In this case, $idVars will contain both the static and dynamic variables, preserving the original string and integer keys.

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