wp_ext2type( string $ext ): string|void
- Since
- 2.5.0
- Source
wp-includes/functions.php:3009
Compatibility
- WordPress
- since 2.5.0
- 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
$extstring- The extension to search.
Return value
string|void- The file type, example: audio, video, document, spreadsheet, etc.
Performance profile
How much work a call to wp_ext2type() 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
- Light
- Scaling
- Scales with input
- Instructions
- 11–16
- Plugin surface
- None
- Called by
- 3
Touches nothing outside its own arguments.
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 18.
Nothing here hands control to plugin code.
3 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 wp_ext2type()
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 wp_ext2type() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 11–16 | strtolower(), wp_get_ext_types() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 18 | 11–16 | 3 | |
| 8.5 | 18 | 11–16 | 3 | |
| 8.4 | 18 | 11–16 | 3 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 21 | 11–19 | 3 | |
| 8.2 | 21 | 11–19 | 3 | |
| 8.1 | 21 | 11–19 | 3 | |
| 7.4 | 21 | 11–19 | 3 |
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
- wp_get_ext_types()Retrieves the list of common file extensions and their types.
Used by · 3
- wp_ajax_send_link_to_editor()Handles sending a link to the editor via AJAX.
- wp_media_upload_handler()Handles the process of uploading media.
- wp_mime_type_icon()Retrieves the icon for a MIME type or attachment.
Source code
function wp_ext2type( $ext ) { $ext = strtolower( $ext ); $ext2type = wp_get_ext_types(); foreach ( $ext2type as $type => $exts ) { if ( in_array( $ext, $exts, true ) ) { return $type; } }}Changelog
Introduced in 2.5.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
string|void to string|null.verified against sourceAbout this page
- Parsed data
- Generated from the wordpress-develop 7.0.4 tag, from
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
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