[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: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:5>
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