What common mistakes can lead to undefined index errors in PHP when accessing associative arrays?

Trying to access an index that does not exist in an associative array can lead to undefined index errors in PHP. To avoid this issue, always check if the index exists in the array before trying to access it using isset() or array_key_exists() functions. 

// Check if the index exists before accessing it
if (isset($array['key'])) {
    $value = $array['key'];
    // Do something with $value
} else {
    // Handle the case when the index does not exist
}

Keywords

PHP associative arrays undefined index error handling debugging

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