[wp-trac] [WordPress Trac] #46063: echo in functions called by add_shortcode()

[WordPress Trac]

#46063: echo in functions called by add_shortcode()
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 Reporter:  kaikli        |       Owner:  (none)
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:
Component:  REST API      |     Version:  5.0.3
 Severity:  normal        |  Resolution:  invalid
 Keywords:                |     Focuses:  javascript, rest-api
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Comment (by kaikli):

 Replying to [comment:1 johnbillion]:
 > Thanks for the report @kaikli . Shortcode callback functions shouldn't
 echo their output, only return it. If your shortcode handler returns its
 output, then the REST API will work as expected.
 >
 > More info here: https://codex.wordpress.org/Shortcode_API

 Thanks for your answer @johnbillion


 I know that shortcode callback functions shouldn't echo their output.

 In my case, it was a function somwhere included in the callback function
 and it was not easy to find this issue.

 \\
 Is it than possible to add a error message, simply saying "Hey, you should
 not echo something in your callback!" or "Hey, a callback function echos
 some data!" or (sry, when this is wrong and wouldn't fix this) include a
 ob_get_clean() in the REST-API.

 \\
 Only producing a error, even with no detailed information, would make it
 plugin developers easier to recognize this problem.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46063#comment:2>
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