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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 |
|---|---|
| 209 | * |
| 210 | * Priority 0 to make it available to lower priority callbacks. |
| 211 | * |
| 212 | * @global int $content_width Content width. |
| 213 | */ |
| 214 | function twentynineteen_content_width() { |
| 215 | // This variable is intended to be overruled from themes. |
| 216 | // Open WPCS issue: {@link https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/issues/1043}. |
| 217 | // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedVariableFound |
| 218 | $GLOBALS['content_width'] = apply_filters( 'twentynineteen_content_width', 640 ); |
| 219 | } |
| 220 | add_action( 'after_setup_theme', 'twentynineteen_content_width', 0 ); |
| 221 | |
| 222 | /** |
| 223 | * Enqueue scripts and styles. |
| 224 | */ |
| 225 | function twentynineteen_scripts() { |
| 226 | wp_enqueue_style( 'twentynineteen-style', get_stylesheet_uri(), array(), wp_get_theme()->get( 'Version' ) ); |
| 227 | |