WP_List_Table::print_column_headers( bool $with_id = true )

Source

public function print_column_headers( $with_id = true ) {
	list( $columns, $hidden, $sortable, $primary ) = $this->get_column_info();

	$current_url = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
	$current_url = remove_query_arg( 'paged', $current_url );

	// When users click on a column header to sort by other columns.
	if ( isset( $_GET['orderby'] ) ) {
		$current_orderby = $_GET['orderby'];
		// In the initial view there's no orderby parameter.
	} else {
		$current_orderby = '';
	}

	// Not in the initial view and descending order.
	if ( isset( $_GET['order'] ) && 'desc' === $_GET['order'] ) {
		$current_order = 'desc';
	} else {
		// The initial view is not always 'asc', we'll take care of this below.
		$current_order = 'asc';
	}

	if ( ! empty( $columns['cb'] ) ) {
		static $cb_counter = 1;
		$columns['cb']     = '<input id="cb-select-all-' . $cb_counter . '" type="checkbox" />
		<label for="cb-select-all-' . $cb_counter . '">' .
			'<span class="screen-reader-text">' .
				/* translators: Hidden accessibility text. */
				__( 'Select All' ) .
			'</span>' .
			'</label>';
		++$cb_counter;
	}

	foreach ( $columns as $column_key => $column_display_name ) {
		$class          = array( 'manage-column', "column-$column_key" );
		$aria_sort_attr = '';
		$abbr_attr      = '';
		$order_text     = '';

		if ( in_array( $column_key, $hidden, true ) ) {
			$class[] = 'hidden';
		}

		if ( 'cb' === $column_key ) {
			$class[] = 'check-column';
		} elseif ( in_array( $column_key, array( 'posts', 'comments', 'links' ), true ) ) {
			$class[] = 'num';
		}

		if ( $column_key === $primary ) {
			$class[] = 'column-primary';
		}

		if ( isset( $sortable[ $column_key ] ) ) {
			$orderby       = isset( $sortable[ $column_key ][0] ) ? $sortable[ $column_key ][0] : '';
			$desc_first    = isset( $sortable[ $column_key ][1] ) ? $sortable[ $column_key ][1] : false;
			$abbr          = isset( $sortable[ $column_key ][2] ) ? $sortable[ $column_key ][2] : '';
			$orderby_text  = isset( $sortable[ $column_key ][3] ) ? $sortable[ $column_key ][3] : '';
			$initial_order = isset( $sortable[ $column_key ][4] ) ? $sortable[ $column_key ][4] : '';

			/*
			 * We're in the initial view and there's no $_GET['orderby'] then check if the
			 * initial sorting information is set in the sortable columns and use that.
			 */
			if ( '' === $current_orderby && $initial_order ) {
				// Use the initially sorted column $orderby as current orderby.
				$current_orderby = $orderby;
				// Use the initially sorted column asc/desc order as initial order.
				$current_order = $initial_order;
			}

			/*
			 * True in the initial view when an initial orderby is set via get_sortable_columns()
			 * and true in the sorted views when the actual $_GET['orderby'] is equal to $orderby.
			 */
			if ( $current_orderby === $orderby ) {
				// The sorted column. The `aria-sort` attribute must be set only on the sorted column.
				if ( 'asc' === $current_order ) {
					$order          = 'desc';
					$aria_sort_attr = ' aria-sort="ascending"';
				} else {
					$order          = 'asc';
					$aria_sort_attr = ' aria-sort="descending"';
				}

				$class[] = 'sorted';
				$class[] = $current_order;
			} else {
				// The other sortable columns.
				$order = strtolower( $desc_first );

				if ( ! in_array( $order, array( 'desc', 'asc' ), true ) ) {
					$order = $desc_first ? 'desc' : 'asc';
				}

				$class[] = 'sortable';
				$class[] = 'desc' === $order ? 'asc' : 'desc';

				/* translators: Hidden accessibility text. */
				$asc_text = __( 'Sort ascending.' );
				/* translators: Hidden accessibility text. */
				$desc_text  = __( 'Sort descending.' );
				$order_text = 'asc' === $order ? $asc_text : $desc_text;
			}

			if ( '' !== $order_text ) {
				$order_text = ' <span class="screen-reader-text">' . $order_text . '</span>';
			}

			// Print an 'abbr' attribute if a value is provided via get_sortable_columns().
			$abbr_attr = $abbr ? ' abbr="' . esc_attr( $abbr ) . '"' : '';

			$column_display_name = sprintf(
				'<a href="%1$s">' .
					'<span>%2$s</span>' .
					'<span class="sorting-indicators">' .
						'<span class="sorting-indicator asc" aria-hidden="true"></span>' .
						'<span class="sorting-indicator desc" aria-hidden="true"></span>' .
					'</span>' .
					'%3$s' .
				'</a>',
				esc_url( add_query_arg( compact( 'orderby', 'order' ), $current_url ) ),
				$column_display_name,
				$order_text
			);
		}

		$tag   = ( 'cb' === $column_key ) ? 'td' : 'th';
		$scope = ( 'th' === $tag ) ? 'scope="col"' : '';
		$id    = $with_id ? "id='$column_key'" : '';

		if ( ! empty( $class ) ) {
			$class = "class='" . implode( ' ', $class ) . "'";
		}

		echo "<$tag $scope $id $class $aria_sort_attr $abbr_attr>$column_display_name</$tag>";
	}
}

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