has_blocks( int|string|WP_Post|null $post = null ): bool
- Since
- 5.0.0
- Source
wp-includes/blocks.php:818
Description
This test optimizes for performance rather than strict accuracy, detecting the pattern of a block but not validating its structure. For strict accuracy, you should use the block parser on post content.
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
$postint|string|WP_Post|nulloptional- Post content, post ID, or post object.
Defaults to global $post.Default:null
Return value
bool- Whether the post has blocks.
Performance profile
How much work a call to has_blocks() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Heavy
- Scaling
- Constant
- Instructions
- 6–14
- Plugin surface
- None
- Called by
- 7
Reaches the database via get_post().
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 15.
Nothing here hands control to plugin code.
7 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- querycontent query
get_post()called directly
Further down the call graph this can also reach hook, option, cache, serialize and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost has_blocks() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
is_string($post) | 6 | none |
!is_string($post) | 10–14 | get_post() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 15 | 6–14 | 2 | |
| 8.5 | 15 | 6–14 | 2 | |
| 8.4 | 15 | 6–14 | 2 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 18 | 9–17 | 2 | |
| 8.2 | 18 | 9–17 | 2 | |
| 8.1 | 18 | 9–17 | 2 | |
| 7.4 | 18 | 9–17 | 2 |
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 · 2
- get_post()Retrieves post data given a post ID or post object.
- str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
Used by · 7
- _WP_Editors::parse_settings()Parse default arguments for the editor instance.
- apply_block_hooks_to_content_from_post_object()Run the Block Hooks algorithm on a post object's content.
- block_version()Returns the current version of the block format that the content string is using.
- do_blocks()Parses dynamic blocks out of `post_content` and re-renders them.
- excerpt_remove_blocks()Parses blocks out of a content string, and renders those appropriate for the excerpt.
- has_block()Determines whether a $post or a string contains a specific block type.
- wp_strip_custom_css_from_blocks()Strips custom CSS (`style.css` in attributes) from all blocks in post content.
Source code
function has_blocks( $post = null ) { if ( ! is_string( $post ) ) { $wp_post = get_post( $post ); if ( ! $wp_post instanceof WP_Post ) { return false; } $post = $wp_post->post_content; } return str_contains( (string) $post, '<!-- wp:' );}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 7.0.4 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.