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Changes between Initial Version and Version 1 of Ticket #53858, comment 38

initial	v1
6	6	There are various solutions plugins/themes can use if we don't backport:
7	7	* Stop using the WP Core function altogether and write their own logic to add the HTML attribute.
8		* Conditionally, depending on the WP version, use `call_user_func('readonly', $args...)`.
	8	* Conditionally, depending on the WP version and PHP version, use `call_user_func('readonly', $args...)`.
9	9	* Polyfill the function when it doesn't exist, but in a separate file, like in the patch here.
10	10