[wp-trac] [WordPress Trac] #63503: Exporting in high data instances results in empty file download

[WordPress Trac]

#63503: Exporting in high data instances results in empty file download
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 Reporter:  bor0                       |       Owner:  (none)
     Type:  defect (bug)               |      Status:  new
 Priority:  normal                     |   Milestone:  Awaiting Review
Component:  Export                     |     Version:  6.8
 Severity:  normal                     |  Resolution:
 Keywords:  needs-test-info has-patch  |     Focuses:
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Comment (by bor0):

 Yup, testing instructions are quite simple, though hard to reproduce on a
 blank install. Our WordPress instance (WooCommerce.com) has a ton of
 posts.

 [[Image(https://core.trac.wordpress.org/raw-
 attachment/ticket/63503/Screenshot%202025-05-29%20at%2022.45.35.png)]]

 1. Navigate to `wp-admin/export.php`
 2. Select `All content`
 3. Click `Export`

 After some time, observe logs:

 {{{
 08:47:06 PM
 PHP message: PHP Fatal error: Allowed memory size of 805306368 bytes
 exhausted (tried to allocate 33554440 bytes) in /var/www/wp-
 admin/includes/export.php on line 590

 08:47:06 PM
 PHP message: Fatal error: Allowed memory size of 805306368 bytes exhausted
 (tried to allocate 33554440 bytes) in /var/www/wp-
 admin/includes/export.php on line 590 [woocommerce.com/wp-
 admin/export.php?download=true&content=all&cat=0&post_author=0&post_start_date=0&post_end_date=0&post_status=0&page_author=0&page_start_date=0&page_end_date=0&page_status=0&attachment_start_date=0&attachment_end_date=0&submit=Download+Export+File]
 []
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/63503#comment:3>
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