How to solve excel export error Codignater PHP.Array and string offset access

How to solve excel export error Codignater PHP.
Array and string offset access syntax with curly braces is deprecated

Modified Excel libary

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[Er.MeetPatel]

thank you sir very helpful.... worked as a life save

[Linklup]

Thank you very much, I solved my problem thanks to you.

[Yulhendra-wjpc]

thank you sir very helpful...this problem clear

[andyrusmawan]

dont work .. Severity: Compile Error

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

Filename: Shared/String.php

Line Number: 538