[wp-trac] [WordPress Trac] #64118: `WP_Block_Type::render` doesn’t pass block instance argument to render_callback

[WordPress Trac]

#64118: `WP_Block_Type::render` doesn’t pass block instance argument to
render_callback
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 Reporter:  Bernhard Reiter  |       Owner:  (none)
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  General          |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by Bernhard Reiter):

 Blocks with render callbacks that require the `WP_Block` instance argument
 fortunately seem to be the exception rather than the rule. However, we
 should probably try to make `WP_Block_Type::render()` work for them
 regardless.

 One way to do so would be to create a `WP_Block` instance on the fly. This
 would however also require parsing the block `$content`. If done
 unconditionally -- i.e. even when a `WP_Block` instance isn't needed --
 this could impact performance rather negatively.

 To remediate that, we could probably use PHP's introspection features to
 check how many arguments the `render_callback` expects. Although that's
 also not exactly elegant...

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Ticket URL: <https://core.trac.wordpress.org/ticket/64118#comment:2>
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