What are the potential consequences of not properly handling key insertions when merging arrays in PHP?

If key insertions are not handled properly when merging arrays in PHP, it can lead to unexpected behavior such as overwriting existing keys or losing data. To avoid this issue, you can use the `+` operator to merge arrays, which will only add elements from the second array that do not already exist in the first array. 

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

$mergedArray = $array1 + $array2;

print_r($mergedArray);

Keywords

array_merge key insertion PHP associative arrays data corruption

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