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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 3326 | * |
| 3327 | * This filter should be used to add, not remove, mime types. To remove |
| 3328 | * mime types, use the {@see 'upload_mimes'} filter. |
| 3329 | * |
| 3330 | * @since 3.5.0 |
| 3331 | * |
| 3332 | * @param string[] $wp_get_mime_types Mime types keyed by the file extension regex |
| 3333 | * corresponding to those types. |
| 3334 | */ |
| 3335 | return apply_filters( |
| 3336 | 'mime_types', |
| 3337 | array( |
| 3338 | // Image formats. |
| 3339 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 3340 | 'gif' => 'image/gif', |
| 3341 | 'png' => 'image/png', |
| 3342 | 'bmp' => 'image/bmp', |
| 3343 | 'tiff|tif' => 'image/tiff', |
| 3344 | 'webp' => 'image/webp', |