apply_filters( ‘page_css_class’, string[] $css_class, WP_Post $page, int $depth, array $args, int $current_page_id )

Filters the list of CSS classes to include with each page item in the list.

Description

$css_classstring[]: An array of CSS classes to be applied to each list item.
$pageWP_Post: Page data object.
$depthint: Depth of page, used for padding.
$argsarray: An array of arguments.
$current_page_idint: ID of the current page.

$css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page_id ) );

Used by	Description
Walker_Page::start_el()`wp-includes/class-walker-page.php`	Outputs the beginning of the current element in the tree.

Version	Description
2.8.0	Introduced.

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