What alternative methods can be used to merge arrays without losing the original keys in PHP?

When merging arrays in PHP using functions like `array_merge` or the `+` operator, the original keys are reindexed starting from 0. To merge arrays without losing the original keys, you can use the `array_merge` function with the `+` operator to combine the arrays while preserving the keys of the first array. 

// Original arrays
$array1 = ['a' => 1, 'b' => 2];
$array2 = ['b' => 3, 'c' => 4];

// Merge arrays without losing original keys
$mergedArray = $array1 + $array2;

// Output the merged array
print_r($mergedArray);

Keywords

array_merge array_replace array_merge_recursive array_replace_recursive preserving keys

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