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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 |
|---|---|
| 1926 | // Redefine the extension / MIME |
| 1927 | $wp_filetype = wp_check_filetype( $new_filename, $mimes ); |
| 1928 | extract( $wp_filetype ); |
| 1929 | } |
| 1930 | } |
| 1931 | } |
| 1932 | |
| 1933 | // Let plugins try and validate other types of files |
| 1934 | // Should return an array in the style of array( 'ext' => $ext, 'type' => $type, 'proper_filename' => $proper_filename ) |
| 1935 | return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes ); |
| 1936 | } |
| 1937 | |
| 1938 | /** |
| 1939 | * Retrieve list of mime types and file extensions. |
| 1940 | * |
| 1941 | * @since 3.5.0 |
| 1942 | * |
| 1943 | * @uses apply_filters() Calls 'mime_types' on returned array. This filter should |
| 1944 | * be used to add types, not remove them. To remove types use the upload_mimes filter. |