Fix PHP7.4 deprecation error #3070
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PHP 7.4 deprecated the use of curly braces to access array/string indexes resulting in errors like this:
ErrorException : Array and string offset access syntax with curly braces is deprecatedThis change makes the code compatible with PHP7.4.
For more information on the deprecation see: https://wiki.php.net/rfc/deprecate_curly_braces_array_access