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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 |
|---|---|
| 3021 | * @type string|false $type File mime type, or false if the file doesn't match a mime type. |
| 3022 | * @type string|false $proper_filename File name with its correct extension, or false if it cannot be determined. |
| 3023 | * } |
| 3024 | * @param string $file Full path to the file. |
| 3025 | * @param string $filename The name of the file (may differ from $file due to |
| 3026 | * $file being in a tmp directory). |
| 3027 | * @param string[] $mimes Array of mime types keyed by their file extension regex. |
| 3028 | * @param string|bool $real_mime The actual mime type or false if the type cannot be determined. |
| 3029 | */ |
| 3030 | return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes, $real_mime ); |
| 3031 | } |
| 3032 | |
| 3033 | /** |
| 3034 | * Returns the real mime type of an image file. |
| 3035 | * |
| 3036 | * This depends on exif_imagetype() or getimagesize() to determine real mime types. |
| 3037 | * |
| 3038 | * @since 4.7.1 |
| 3039 | * |