[wp-trac] [WordPress Trac] #46630: Remove SPL-Autoload polyfill

[WordPress Trac]

#46630: Remove SPL-Autoload polyfill
----------------------------+-----------------------------
 Reporter:  ayeshrajans     |      Owner:  (none)
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Bootstrap/Load  |    Version:  trunk
 Severity:  normal          |   Keywords:
  Focuses:  performance     |
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 Follow up to #46594 and #40109

 PHP 7.2 deprecated the `__autoload` function to autoload PHP classes in
 favor of `spl_autoload_register`. For PHP versions <= 5.2, one can have
 PHP versions without `SPL`, which added the `spl_autoload_register`.

 To make sure tests pass, I split the WordPress's `__autoload`
 implementation to a separate file `spl-autoload-compat.php`.

 Now that we require PHP 5.6.30 in trunk, we can safely remove this
 polyfill!

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Ticket URL: <https://core.trac.wordpress.org/ticket/46630>
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