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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 |
|---|---|
| 2991 | * @type string|false $type File mime type, or false if the file doesn't match a mime type. |
| 2992 | * @type string|false $proper_filename File name with its correct extension, or false if it cannot be determined. |
| 2993 | * } |
| 2994 | * @param string $file Full path to the file. |
| 2995 | * @param string $filename The name of the file (may differ from $file due to |
| 2996 | * $file being in a tmp directory). |
| 2997 | * @param string[] $mimes Array of mime types keyed by their file extension regex. |
| 2998 | * @param string|bool $real_mime The actual mime type or false if the type cannot be determined. |
| 2999 | */ |
| 3000 | return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes, $real_mime ); |
| 3001 | } |
| 3002 | |
| 3003 | /** |
| 3004 | * Returns the real mime type of an image file. |
| 3005 | * |
| 3006 | * This depends on exif_imagetype() or getimagesize() to determine real mime types. |
| 3007 | * |
| 3008 | * @since 4.7.1 |
| 3009 | * |