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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 |
|---|---|
| 207 | * Sets the content width in pixels, based on the theme's design and stylesheet. |
| 208 | * |
| 209 | * Priority 0 to make it available to lower priority callbacks. |
| 210 | * |
| 211 | * @global int $content_width |
| 212 | * |
| 213 | * @since Twenty Sixteen 1.0 |
| 214 | */ |
| 215 | function twentysixteen_content_width() { |
| 216 | $GLOBALS['content_width'] = apply_filters( 'twentysixteen_content_width', 840 ); |
| 217 | } |
| 218 | add_action( 'after_setup_theme', 'twentysixteen_content_width', 0 ); |
| 219 | |
| 220 | /** |
| 221 | * Registers a widget area. |
| 222 | * |
| 223 | * @link https://developer.wordpress.org/reference/functions/register_sidebar/ |
| 224 | * |
| 225 | * @since Twenty Sixteen 1.0 |