What are some common mistakes to watch out for when working with arrays in PHP?

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

// Incorrect way to access array key without checking if it exists
$array = ['key' => 'value'];
echo $array['wrong_key']; // This will result in an "Undefined index" error

// Correct way to check if array key exists before accessing it
if(isset($array['key'])) {
    echo $array['key'];
}

Keywords

array PHP mistakes common watch out

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