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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 |
|---|---|
| 1898 | * @since 3.5.0 |
| 1899 | * |
| 1900 | * @uses apply_filters() Calls 'mime_types' on returned array. This filter should |
| 1901 | * be used to add types, not remove them. To remove types use the upload_mimes filter. |
| 1902 | * |
| 1903 | * @return array Array of mime types keyed by the file extension regex corresponding to those types. |
| 1904 | */ |
| 1905 | function wp_get_mime_types() { |
| 1906 | // Accepted MIME types are set here as PCRE unless provided. |
| 1907 | return apply_filters( 'mime_types', array( |
| 1908 | // Image formats |
| 1909 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 1910 | 'gif' => 'image/gif', |
| 1911 | 'png' => 'image/png', |
| 1912 | 'bmp' => 'image/bmp', |
| 1913 | 'tif|tiff' => 'image/tiff', |
| 1914 | 'ico' => 'image/x-icon', |
| 1915 | // Video formats |
| 1916 | 'asf|asx' => 'video/x-ms-asf', |