$config = parse_ini_file('config.ini'); if (hasKey($config, 'username')) { echo 'Username exists!'; } else { echo 'Username does not exist.'; }
$array = array('key1' => 'value1', 'key2' => 'value2'); if (hasKey($array, 'key1')) { echo 'Key1 exists!'; } else { echo 'Key1 does not exist.'; }In this example, we have an array with two key-value pairs. We use the hasKey() method to check if the key 'key1' exists in the array. It is difficult to determine a specific package library without more context, as many PHP libraries and frameworks could potentially include a hasKey() method.