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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 |
|---|---|
| 52 | * @type int $width Width in pixels of the custom header image. Default 1200. |
| 53 | * @type int $height Height in pixels of the custom header image. Default 280. |
| 54 | * @type bool $flex-height Whether to allow flexible-height header images. Default true. |
| 55 | * @type callable $wp-head-callback Callback function used to style the header image and text |
| 56 | * displayed on the blog. |
| 57 | * } |
| 58 | */ |
| 59 | add_theme_support( |
| 60 | 'custom-header', |
| 61 | apply_filters( |
| 62 | 'twentysixteen_custom_header_args', |
| 63 | array( |
| 64 | 'default-text-color' => $default_text_color, |
| 65 | 'width' => 1200, |
| 66 | 'height' => 280, |
| 67 | 'flex-height' => true, |
| 68 | 'wp-head-callback' => 'twentysixteen_header_style', |
| 69 | ) |
| 70 | ) |