[wp-trac] [WordPress Trac] #40954: Create Category within posts screen error

[WordPress Trac]

#40954: Create Category within posts screen error
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 Reporter:  cfastenrath        |       Owner:  (none)
     Type:  defect (bug)       |      Status:  closed
 Priority:  normal             |   Milestone:
Component:  Posts, Post Types  |     Version:  4.8
 Severity:  normal             |  Resolution:  invalid
 Keywords:  close              |     Focuses:  javascript
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Comment (by hmazadev000):

 Replying to [comment:5 hmazadev000]:
 > Replying to [comment:4 hmazadev000]:
 > > Replying to [comment:3 hmazadev000]:
 > > > Replying to [comment:1 cfastenrath]:
 > > > > There were additional lines after the closing php tag in an
 uploaded file in the plugin folder.
 > > > > Therefore headers were already sent which results in this error!.
 > > > >
 > > > This error happens when there are unintended characters or lines
 after the closing ?> PHP tag in the file. Removing any extra lines or
 spaces after the closing tag should resolve the issue.
 > > In PHP files, it’s often recommended to avoid the closing ?> tag
 entirely, especially for files that contain only PHP code. This helps
 prevent accidental output of whitespace or new lines, which can cause the
 "headers already sent" error.
 > Sometimes, output functions like echo or print within the file, if
 executed before setting headers, can also trigger this error. Make sure
 there’s no unintended output before any headers are sent.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40954#comment:6>
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