Array declaration syntax breaks older versions of PHP

D 7.56 all other modules and themes up to date.
Database system MySQL, MariaDB, or equivalent
Database system version 5.6.37-82.2-log
Database updates Up to date
PHP 5.3.29
Web server Apache/2

When I tried to upgrade from audiofield-7.x-1.2 to audiofield-7.x-1.3, as I ran update.php, I got a white screen. I removed the folder, and put the audiofield-7.x-1.2 version back, and got the site back up.

The first section of code (below) was from the hosting provider. The notice statement is after I got back into the site from the error logs. The last section is my Drupal settings on the site.

20180123T190251: theochandler.com/index.php PHP Parse error:  syntax error, unexpected '[' in /.../theochandler.com/sites/all/modules/audiofield/audiofield.module on line 542

Notice: Undefined variable: finished in _batch_process() (line 344 of /.../theochandler.com/includes/batch.inc).

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