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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 |
|---|---|
| 1861 | * @since 3.5.0 |
| 1862 | * |
| 1863 | * @uses apply_filters() Calls 'mime_types' on returned array. This filter should |
| 1864 | * be used to add types, not remove them. To remove types use the upload_mimes filter. |
| 1865 | * |
| 1866 | * @return array Array of mime types keyed by the file extension regex corresponding to those types. |
| 1867 | */ |
| 1868 | function wp_get_mime_types() { |
| 1869 | // Accepted MIME types are set here as PCRE unless provided. |
| 1870 | return apply_filters( 'mime_types', array( |
| 1871 | // Image formats |
| 1872 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 1873 | 'gif' => 'image/gif', |
| 1874 | 'png' => 'image/png', |
| 1875 | 'bmp' => 'image/bmp', |
| 1876 | 'tif|tiff' => 'image/tiff', |
| 1877 | 'ico' => 'image/x-icon', |
| 1878 | // Video formats |
| 1879 | 'asf|asx|wax|wmv|wmx' => 'video/asf', |