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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 |
|---|---|
| 2698 | * |
| 2699 | * This filter should be used to add, not remove, mime types. To remove |
| 2700 | * mime types, use the {@see 'upload_mimes'} filter. |
| 2701 | * |
| 2702 | * @since 3.5.0 |
| 2703 | * |
| 2704 | * @param array $wp_get_mime_types Mime types keyed by the file extension regex |
| 2705 | * corresponding to those types. |
| 2706 | */ |
| 2707 | return apply_filters( |
| 2708 | 'mime_types', |
| 2709 | array( |
| 2710 | // Image formats. |
| 2711 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 2712 | 'gif' => 'image/gif', |
| 2713 | 'png' => 'image/png', |
| 2714 | 'bmp' => 'image/bmp', |
| 2715 | 'tiff|tif' => 'image/tiff', |
| 2716 | 'ico' => 'image/x-icon', |