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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 |
|---|---|
| 1883 | // Redefine the extension / MIME |
| 1884 | $wp_filetype = wp_check_filetype( $new_filename, $mimes ); |
| 1885 | extract( $wp_filetype ); |
| 1886 | } |
| 1887 | } |
| 1888 | } |
| 1889 | |
| 1890 | // Let plugins try and validate other types of files |
| 1891 | // Should return an array in the style of array( 'ext' => $ext, 'type' => $type, 'proper_filename' => $proper_filename ) |
| 1892 | return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes ); |
| 1893 | } |
| 1894 | |
| 1895 | /** |
| 1896 | * Retrieve list of mime types and file extensions. |
| 1897 | * |
| 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. |