How does the behavior of the + operator differ from array_merge when concatenating arrays in PHP?

The behavior of the + operator when concatenating arrays in PHP differs from array_merge in that the + operator only combines arrays if they have unique keys, while array_merge will merge arrays regardless of key uniqueness. To solve this issue and ensure all elements are combined, you can use array_merge to merge the arrays. 

$array1 = ['a' => 'apple', 'b' => 'banana'];
$array2 = ['b' => 'blueberry', 'c' => 'cherry'];

// Using array_merge to concatenate arrays
$combinedArray = array_merge($array1, $array2);

print_r($combinedArray);

Keywords

PHP + operator array_merge concatenating arrays behavior

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