Why Am I Getting \'Error Trapped: Array Offset Access on Boolean Value\' in PHP 7.4?

Error Trapped: Array Offset Access on Boolean Value in PHP 7.4

Query:

After upgrading to PHP 7.4.1, the following error occurs:

Notice: Trying to access array offset on value of type bool in

within this code block:

public static function read($id)
{
    $Row = MySQL::query("SELECT `Data` FROM `cb_sessions` WHERE `SessionID` = '$id'", TRUE);
    
    # http://php.net/manual/en/function.session-start.php#120589
    //check to see if $session_data is null before returning (CRITICAL)
    if(is_null($Row['Data']))
    {
        $session_data = '';
    }
    else
    {
        $session_data = $Row['Data'];
    }
    
    return $session_data;
}

Solution:

PHP 7.4 enforces stricter type checking, causing this error when $Row['Data'] might be null. To resolve this, use the null coalescing operator (??) to assign a default value if $Row['Data'] is null:

return $Row['Data'] ?? 'default value';

Alternatively, you can use the null coalescing assignment operator (??=) to set the default value if $Row['Data'] is null:

$Row['Data'] ??= 'default value';
return $Row['Data'];

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