What potential pitfalls should developers be aware of when using arrays in PHP?

One potential pitfall when using arrays in PHP is not properly checking if an array key exists before accessing it. This can lead to errors or warnings if the key does not exist in the array. To avoid this issue, developers should always use functions like `isset()` or `array_key_exists()` to check if a key exists before trying to access it. 

// Check if a key exists before accessing it
if (isset($array['key'])) {
    // Access the key
    $value = $array['key'];
} else {
    // Handle the case where the key does not exist
    $value = null;
}

Keywords

array functions memory usage indexing multidimensional arrays data manipulation

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