Are there any common pitfalls to avoid when working with arrays in PHP?

One common pitfall when working with arrays in PHP is not checking if an array key exists before trying to access it. This can lead to "Undefined index" notices or errors. To avoid this, always use the isset() function to check if a key exists before trying to access it. 

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

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