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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 |
|---|---|
| 29 | * @type int $width Width in pixels of the custom header image. Default 1260. |
| 30 | * @type int $height Height in pixels of the custom header image. Default 240. |
| 31 | * @type bool $flex_height Whether to allow flexible-height header images. Default true. |
| 32 | * @type string $admin_head_callback Callback function used to style the image displayed in |
| 33 | * the Appearance > Header screen. |
| 34 | * @type string $admin_preview_callback Callback function used to create the custom header markup in |
| 35 | * the Appearance > Header screen. |
| 36 | * } |
| 37 | */ |
| 38 | add_theme_support( 'custom-header', apply_filters( 'twentyfourteen_custom_header_args', array( |
| 39 | 'default-text-color' => 'fff', |
| 40 | 'width' => 1260, |
| 41 | 'height' => 240, |
| 42 | 'flex-height' => true, |
| 43 | 'wp-head-callback' => 'twentyfourteen_header_style', |
| 44 | 'admin-head-callback' => 'twentyfourteen_admin_header_style', |
| 45 | 'admin-preview-callback' => 'twentyfourteen_admin_header_image', |
| 46 | ) ) ); |
| 47 | } |