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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 |
|---|---|
| 113 | |
| 114 | // The default header text color |
| 115 | define( 'HEADER_TEXTCOLOR', '000' ); |
| 116 | |
| 117 | // By leaving empty, we allow for random image rotation. |
| 118 | define( 'HEADER_IMAGE', '' ); |
| 119 | |
| 120 | // The height and width of your custom header. |
| 121 | // Add a filter to twentyeleven_header_image_width and twentyeleven_header_image_height to change these values. |
| 122 | define( 'HEADER_IMAGE_WIDTH', apply_filters( 'twentyeleven_header_image_width', 1000 ) ); |
| 123 | define( 'HEADER_IMAGE_HEIGHT', apply_filters( 'twentyeleven_header_image_height', 288 ) ); |
| 124 | |
| 125 | // We'll be using post thumbnails for custom header images on posts and pages. |
| 126 | // We want them to be the size of the header image that we just defined |
| 127 | // Larger images will be auto-cropped to fit, smaller ones will be ignored. See header.php. |
| 128 | set_post_thumbnail_size( HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT, true ); |
| 129 | |
| 130 | // Add Twenty Eleven's custom image sizes |
| 131 | add_image_size( 'large-feature', HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT, true ); // Used for large feature (header) images |