do_blocks( string $content ): string
- Since
- 5.0.0
- Source
wp-includes/blocks.php:2238
post_content and re-renders them.Compatibility
- WordPress
- since 5.0.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Parameters
$contentstring- Post content.
Return value
string- Updated post content.
Performance profile
How much work a call to do_blocks() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Heavy
- Scaling
- Scales with input
- Instructions
- 16–36
- Plugin surface
- None
- Called by
- 5
Reaches the database via get_post().
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 41.
Nothing here hands control to plugin code.
5 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- hookthird-party callbacks
apply_filters()one call below do_blocks() - querycontent query
get_post()one call below do_blocks()
Further down the call graph this can also reach option, cache, serialize and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 4 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost do_blocks() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
$priority === false | 16–17 | parse_blocks(), has_filter() |
$priority !== false && !doing_filter() | 20–21 | parse_blocks(), has_filter(), doing_filter() |
$priority !== false && doing_filter() && !has_blocks() | 24–25 | parse_blocks(), has_filter(), doing_filter(), has_blocks() |
$priority !== false && doing_filter() && has_blocks() | 35–36 | parse_blocks(), has_filter(), doing_filter(), has_blocks(), remove_filter(), add_filter() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 41 instructions, 16–36 executed per call, 5 branches. The work does not change between versions.
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Uses · 7
- parse_blocks()Parses blocks out of a content string.
- render_block()Renders a single block into a HTML string.
- has_filter()Checks if any filter has been registered for a hook.
- doing_filter()Returns whether or not a filter hook is currently being processed.
- has_blocks()Determines whether a post or content string has blocks.
- remove_filter()Removes a callback function from a filter hook.
- add_filter()Adds a callback function to a filter hook.
Used by · 5
- block_template_part()Prints a block template part.
- get_the_block_template_html()Returns the markup for the current template.
- render_block_core_block()Renders the `core/block` block on server.
- render_block_core_pattern()Renders the `core/pattern` block on the server.
- render_block_core_template_part()Renders the `core/template-part` block on the server.
Source code
function do_blocks( $content ) { $blocks = parse_blocks( $content ); $output = ''; foreach ( $blocks as $block ) { $output .= render_block( $block ); } // If there are blocks in this content, we shouldn't run wpautop() on it later. $priority = has_filter( 'the_content', 'wpautop' ); if ( false !== $priority && doing_filter( 'the_content' ) && has_blocks( $content ) ) { remove_filter( 'the_content', 'wpautop', $priority ); add_filter( 'the_content', '_restore_wpautop_hook', $priority + 1 ); } return $output;}Changelog
Introduced in 5.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
About this page
- Parsed data
- Generated from the wordpress-develop 6.7.7 tag, from
src/wp-includes/blocks.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.