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Block Hooks: Allow traversal callbacks to modify parent block #5598

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ockham wants to merge 7 commits into from
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Block Hooks: Allow traversal callbacks to modify parent block #5598

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6da854f
Block Hooks: Pass parent block by reference
ockham Oct 31, 2023
6f4d043
Pass reference to callback
ockham Oct 31, 2023
340c72b
Plural
ockham Oct 31, 2023
dd0f252
Pass as reference at callsite
ockham Oct 31, 2023
50a340a
Document that block and parent_block are passed by reference
ockham Oct 31, 2023
39c5993
Document that parent_block, prev, and next default to null
ockham Oct 31, 2023
7aa6c9c
Rename var from parent to parent_block
ockham Oct 31, 2023
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Rename var from parent to parent_block
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@ockham
ockham committed Oct 31, 2023
commit 7aa6c9cd0c99f3281995458fe54effd3d7ccf651
9 changes: 5 additions & 4 deletions src/wp-includes/blocks.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1131,8 +1131,9 @@ function traverse_and_serialize_block( $block, $pre_callback = null, $post_callb
* @return string Serialized block markup.
*/
function traverse_and_serialize_blocks( $blocks, $pre_callback = null, $post_callback = null ) {
$result = '';
$parent = null; // At the top level, there is no parent block to pass to the callbacks; yet the callbacks expect a reference.
$result = '';
$parent_block = null; // At the top level, there is no parent block to pass to the callbacks; yet the callbacks expect a reference.

foreach ( $blocks as $index => $block ) {
if ( is_callable( $pre_callback ) ) {
$prev = 0 === $index
Expand All @@ -1141,7 +1142,7 @@ function traverse_and_serialize_blocks( $blocks, $pre_callback = null, $post_cal

$result .= call_user_func_array(
$pre_callback,
array( &$block, &$parent, $prev )
array( &$block, &$parent_block, $prev )
);
}

Expand All @@ -1152,7 +1153,7 @@ function traverse_and_serialize_blocks( $blocks, $pre_callback = null, $post_cal

$post_markup = call_user_func_array(
$post_callback,
array( &$block, &$parent, $next )
array( &$block, &$parent_block, $next )
);
}

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