wp_dropdown_pages() WP 1.0

Retrieve or display list of pages as a dropdown (select list).

Hooks in function

Return

String. HTML content, if not displaying.

Usage

wp_dropdown_pages( $args );

$args(array/string)

Array or string of arguments to generate a page dropdown. See get_pages() for additional arguments.

• $depth (int)
  Maximum depth.

• $child_of (int)
  Page ID to retrieve child pages of.

• $selected (int/string)
  Value of the option that should be selected.

• $echo (true/false/int)
  Whether to echo or return the generated markup. Accepts 0, 1, or their bool equivalents.
  Default: 1

• $name (string)
  Value for the 'name' attribute of the select element.
  Default: 'page_id'

• $id (string)
  Value for the 'id' attribute of the select element.

• $class (string)
  Value for the 'class' attribute of the select element. Default: none.
  Default: value of $name

• $show_option_none (string)
  Text to display for showing no pages.
  Default: empty (does not display)

• $show_option_no_change (string)
  Text to display for "no change" option.
  Default: empty (does not display)

• $option_none_value (string)
  Value to use when no page is selected.
  Default: ''

• $value_field (string)
  Post field used to populate the 'value' attribute of the option elements. Accepts any valid post field.
  Default: 'ID'

Default: ''

Code of wp dropdown pages: wp-includes/post-template.php ^{WP 5.2.1}

<?php
function wp_dropdown_pages( $args = '' ) {
	$defaults = array(
		'depth'                 => 0,
		'child_of'              => 0,
		'selected'              => 0,
		'echo'                  => 1,
		'name'                  => 'page_id',
		'id'                    => '',
		'class'                 => '',
		'show_option_none'      => '',
		'show_option_no_change' => '',
		'option_none_value'     => '',
		'value_field'           => 'ID',
	);

	$r = wp_parse_args( $args, $defaults );

	$pages  = get_pages( $r );
	$output = '';
	// Back-compat with old system where both id and name were based on $name argument
	if ( empty( $r['id'] ) ) {
		$r['id'] = $r['name'];
	}

	if ( ! empty( $pages ) ) {
		$class = '';
		if ( ! empty( $r['class'] ) ) {
			$class = " class='" . esc_attr( $r['class'] ) . "'";
		}

		$output = "<select name='" . esc_attr( $r['name'] ) . "'" . $class . " id='" . esc_attr( $r['id'] ) . "'>\n";
		if ( $r['show_option_no_change'] ) {
			$output .= "\t<option value=\"-1\">" . $r['show_option_no_change'] . "</option>\n";
		}
		if ( $r['show_option_none'] ) {
			$output .= "\t<option value=\"" . esc_attr( $r['option_none_value'] ) . '">' . $r['show_option_none'] . "</option>\n";
		}
		$output .= walk_page_dropdown_tree( $pages, $r['depth'], $r );
		$output .= "</select>\n";
	}

	/**
	 * Filters the HTML output of a list of pages as a drop down.
	 *
	 * @since 2.1.0
	 * @since 4.4.0 `$r` and `$pages` added as arguments.
	 *
	 * @param string $output HTML output for drop down list of pages.
	 * @param array  $r      The parsed arguments array.
	 * @param array  $pages  List of WP_Post objects returned by `get_pages()`
	 */
	$html = apply_filters( 'wp_dropdown_pages', $output, $r, $pages );

	if ( $r['echo'] ) {
		echo $html;
	}
	return $html;
}

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From tag: List (wp_list)

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