How can the issue of "Undefined index" and "Illegal string offset" errors be resolved when working with JSON arrays in PHP?

The "Undefined index" error occurs when trying to access an index in a JSON array that doesn't exist, while the "Illegal string offset" error occurs when trying to treat a string as an array. To resolve these issues, you can first check if the index exists using isset() or array_key_exists() functions before accessing it. Additionally, ensure that you are treating the JSON data correctly by decoding it using json_decode() with the second parameter set to true for associative arrays. 

// Sample JSON data
$json_data = '{"key1": "value1", "key2": "value2"}';

// Decode JSON data into an associative array
$data = json_decode($json_data, true);

// Check if the index exists before accessing it
if (isset($data['key1'])) {
    echo $data['key1'];
}

Keywords

PHP JSON arrays Undefined index Illegal string offset

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