Array and string offset access syntax with curly braces is no longer supported

// Change the code from 
$myVar{$idx}

// to
$myVar[$idx]

If you have recently started using one of the latest versions of PHP, such as PHP 8.0 or PHP 8.1, you may encounter the following error when running old PHP code:

The reason is that with PHP 7.4 the array and string offset access syntax using curly braces is deprecated and it was removed entirely in PHP 8.0

// Instead of:
$array{0};
$array{"key"};

// Write:
$array[0];
$array["key"];