get_post_mime_type( int|WP_Post $post = null ): string|false
- Since
- 2.0.0
- Source
wp-includes/post.php:1230
Description
This function can be used with any post type, but it makes more sense with attachments.
Compatibility
- WordPress
- since 2.0.0
- 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|WP_Postoptional- Post ID or post object. Defaults to global $post.Default:
null
Return value
string|false- The mime type on success, false on failure.
Performance profile
How much work a call to get_post_mime_type() 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
- 8–9
- Plugin surface
- None
- Called by
- 5
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 10.
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
- 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 · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost get_post_mime_type() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 8–9 | get_post() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 10 instructions, 8–9 executed per call, 1 branch. 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 · 1
- get_post()Retrieves post data given a post ID or post object.
Used by · 5
- WP_REST_Attachments_Controller::edit_media_item()Applies edits to a media item and creates a new attachment record.
- WP_REST_Attachments_Controller::handle_featured_media()Determines the featured media based on a request param.
- get_body_class()Retrieves an array of the class names for the body element.
- wp_generate_attachment_metadata()Generates attachment meta data and create image sub-sizes for images.
- wp_image_editor()Loads the WP image-editing interface.
Source code
function get_post_mime_type( $post = null ) { $post = get_post( $post ); if ( is_object( $post ) ) { return $post->post_mime_type; } return false;}Changelog
Introduced in 2.0.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$post retyped from int|WP_Post to int|WP_Post|null.verified against sourceAbout this page
- Parsed data
- Generated from the wordpress-develop 6.9.7 tag, from
src/wp-includes/post.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.