What are common errors in PHP scripts that can lead to undefined variables and indexes?

Common errors in PHP scripts that can lead to undefined variables and indexes include accessing variables that have not been initialized or trying to access array elements that do not exist. To avoid these errors, always make sure to initialize variables before using them and check if array indexes exist before trying to access them. 

// Example of initializing variables and checking array indexes

// Initializing variables
$variable = '';

// Checking if array index exists before accessing it
$array = ['key' => 'value'];
if (isset($array['key'])) {
    echo $array['key'];
}

Keywords

PHP undefined variables undefined indexes error handling debugging

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