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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 |
|---|---|
| 134 | * Sets the content width in pixels, based on the theme's design and stylesheet. |
| 135 | * |
| 136 | * Priority 0 to make it available to lower priority callbacks. |
| 137 | * |
| 138 | * @global int $content_width |
| 139 | * |
| 140 | * @since Twenty Sixteen 1.0 |
| 141 | */ |
| 142 | function twentysixteen_content_width() { |
| 143 | $GLOBALS['content_width'] = apply_filters( 'twentysixteen_content_width', 840 ); |
| 144 | } |
| 145 | add_action( 'after_setup_theme', 'twentysixteen_content_width', 0 ); |
| 146 | |
| 147 | /** |
| 148 | * Registers a widget area. |
| 149 | * |
| 150 | * @link https://developer.wordpress.org/reference/functions/register_sidebar/ |
| 151 | * |
| 152 | * @since Twenty Sixteen 1.0 |