PHP7.4: Array and string offset access syntax with curly braces is deprecated

[JamesDPC]

Hi, getting some deprecation errors when using PHP 7.4:

Deprecated: Array and string offset access syntax with curly braces is deprecated in ......./vendor/symbiote/silverstripe-pdfrendition/src/Model/ComposedPdf.php on line 184

Deprecated: Array and string offset access syntax with curly braces is deprecated in ......./vendor/symbiote/silverstripe-pdfrendition/src/Service/PDFRenditionService.php on line 196

Ref:
https://github.com/nyeholt/silverstripe-pdfrendition/blob/master/src/Model/ComposedPdf.php#L184
https://github.com/nyeholt/silverstripe-pdfrendition/blob/master/src/Service/PDFRenditionService.php#L196

By the looks in both cases it's a quick fix to [ ] e.g $absPath[ strlen($absPath) - 1 ] $href[ 0 ] and also checking that the array index exists prior.

RFC:
https://wiki.php.net/rfc/deprecate_curly_braces_array_access

Cheers
James