What potential pitfalls should be considered when using array_combine in PHP, especially with arrays containing duplicate keys?

When using array_combine in PHP with arrays containing duplicate keys, potential pitfalls to consider include losing data due to overwriting values, unexpected behavior when accessing elements by key, and difficulties in debugging due to inconsistent results. To solve this issue, one approach is to preprocess the arrays to ensure unique keys before combining them. 

$array1 = ['key1', 'key2', 'key3'];
$array2 = ['value1', 'value2', 'value3'];
$combinedArray = array_combine(array_map(function($key, $value) {
    return $key . '_' . uniqid();
}, $array1, $array2), $array2);

Keywords

array_combine PHP duplicate keys associative arrays data integrity

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