What is the error message "Array to string conversion" in PHP and how can it be resolved?

The error message "Array to string conversion" in PHP occurs when you try to treat an array as a string, which is not allowed in PHP. To resolve this issue, you need to ensure that you are not trying to concatenate an array with a string or use an array where a string is expected. You can use functions like implode() to convert an array to a string before using it in a string context.

// Example of resolving "Array to string conversion" error
$array = array('apple', 'banana', 'cherry');
$string = implode(', ', $array);
echo $string;