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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 |
|---|---|
| 145 | if ( ! empty( $value ) ) { |
| 146 | $value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value ); |
| 147 | $attributes .= ' ' . $attr . '="' . $value . '"'; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | $item_output = $args->before; |
| 152 | $item_output .= '<a'. $attributes .'>'; |
| 153 | /** This filter is documented in wp-includes/post-template.php */ |
| 154 | $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after; |
| 155 | $item_output .= '</a>'; |
| 156 | $item_output .= $args->after; |
| 157 | |
| 158 | /** |
| 159 | * Filter a menu item's starting output. |
| 160 | * |
| 161 | * The menu item's starting output only includes `$args->before`, the opening `<a>`, |
| 162 | * the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is |
| 163 | * no filter for modifying the opening and closing `<li>` for a menu item. |