BuddyPress Datebox +18 (you have to be at least 18)

datebox-18-buddypress.php

<?php 

/**
 * Datebox +18 xprofile field type.
 *
 * @since BuddyPress (2.0.1)
 * @author bi0xid
 */
class BP_XProfile_Field_Type_Datebox18 extends BP_XProfile_Field_Type {

	/**
	 * Constructor for the datebox +18 field type
	 *
	 * @since BuddyPress (2.0.0)
 	 */
	public function __construct() {
		parent::__construct();

		$this->category = _x( 'Single Fields', 'xprofile field type category', 'buddypress' );
		$this->name     = _x( 'Date Selector +18', 'xprofile field type', 'buddypress' );

		$this->set_format( '/^\d{4}-\d{1,2}-\d{1,2} 00:00:00$/', 'replace' );  // "Y-m-d 00:00:00"
		do_action( 'bp_xprofile_field_type_datebox18', $this );
	}

	/**
	 * Output the edit field HTML for this field type.
	 *
	 * Must be used inside the {@link bp_profile_fields()} template loop.
	 *
	 * @param array $raw_properties Optional key/value array of {@link http://dev.w3.org/html5/markup/input.html permitted attributes} that you want to add.
	 * @since BuddyPress (2.0.0)
	 */
	public function edit_field_html( array $raw_properties = array() ) {
		$user_id = bp_displayed_user_id();

		// user_id is a special optional parameter that we pass to {@link bp_the_profile_field_options()}.
		if ( isset( $raw_properties['user_id'] ) ) {
			$user_id = (int) $raw_properties['user_id'];
			unset( $raw_properties['user_id'] );
		}

		$day_html = $this->get_edit_field_html_elements( array_merge(
			array(
				'id'   => bp_get_the_profile_field_input_name() . '_day',
				'name' => bp_get_the_profile_field_input_name() . '_day',
			),
			$raw_properties
		) );

		$month_html = $this->get_edit_field_html_elements( array_merge(
			array(
				'id'   => bp_get_the_profile_field_input_name() . '_month',
				'name' => bp_get_the_profile_field_input_name() . '_month',
			),
			$raw_properties
		) );

		$year_html = $this->get_edit_field_html_elements( array_merge(
			array(
				'id'   => bp_get_the_profile_field_input_name() . '_year',
				'name' => bp_get_the_profile_field_input_name() . '_year',
			),
			$raw_properties
		) );
	?>
		<div class="datebox">

			<label for="<?php bp_the_profile_field_input_name(); ?>_day"><?php bp_the_profile_field_name(); ?> <?php if ( bp_get_the_profile_field_is_required() ) : ?><?php esc_html_e( '(required)', 'buddypress' ); ?><?php endif; ?></label>
			<?php do_action( bp_get_the_profile_field_errors_action() ); ?>

			<select <?php echo $day_html; ?>>
				<?php bp_the_profile_field_options( array( 'type' => 'day', 'user_id' => $user_id ) ); ?>
			</select>

			<select <?php echo $month_html; ?>>
				<?php bp_the_profile_field_options( array( 'type' => 'month', 'user_id' => $user_id ) ); ?>
			</select>

			<select <?php echo $year_html; ?>>
				<?php bp_the_profile_field_options( array( 'type' => 'year', 'user_id' => $user_id ) ); ?>
			</select>

		</div>
	<?php
	}

	/**
	 * Output the edit field options HTML for this field type.
	 *
	 * BuddyPress considers a field's "options" to be, for example, the items in a selectbox.
	 * These are stored separately in the database, and their templating is handled seperately.
	 *
	 * This templating is separate from {@link BP_XProfile_Field_Type::edit_field_html()} because
	 * it's also used in the wp-admin screens when creating new fields, and for backwards compatibility.
	 *
	 * Must be used inside the {@link bp_profile_fields()} template loop.
	 *
	 * @param array $args Optional. The arguments passed to {@link bp_the_profile_field_options()}.
	 * @since BuddyPress (2.0.0)
	 */
	public function edit_field_options_html( array $args = array() ) {
		$options = $this->field_obj->get_children();
		$date    = BP_XProfile_ProfileData::get_value_byid( $this->field_obj->id, $args['user_id'] );

		$day   = 0;
		$month = 0;
		$year  = 0;
		$html  = '';

		// Set day, month, year defaults
		if ( ! empty( $date ) ) {

			// If Unix timestamp
			if ( is_numeric( $date ) ) {
				$day   = date( 'j', $date );
				$month = date( 'F', $date );
				$year  = date( 'Y', $date );

			// If MySQL timestamp
			} else {
				$day   = mysql2date( 'j', $date );
				$month = mysql2date( 'F', $date, false ); // Not localized, so that selected() works below
				$year  = mysql2date( 'Y', $date );
			}
		}

		// Check for updated posted values, and errors preventing them from being saved first time.
		if ( ! empty( $_POST['field_' . $this->field_obj->id . '_day'] ) ) {
			$new_day = (int) $_POST['field_' . $this->field_obj->id . '_day'];
			$day     = ( $day != $new_day ) ? $new_day : $day;
		}

		if ( ! empty( $_POST['field_' . $this->field_obj->id . '_month'] ) ) {
			$new_month = (int) $_POST['field_' . $this->field_obj->id . '_month'];
			$month     = ( $month != $new_month ) ? $new_month : $month;
		}

		if ( ! empty( $_POST['field_' . $this->field_obj->id . '_year'] ) ) {
			$new_year = date( 'j', (int) $_POST['field_' . $this->field_obj->id . '_year'] );
			$year     = ( $year != $new_year ) ? $new_year : $year;
		}

		// $type will be passed by calling function when needed
		switch ( $args['type'] ) {
			case 'day':
				$html = sprintf( '<option value="" %1$s>%2$s</option>', selected( $day, 0, false ), /* translators: no option picked in select box */ __( '----', 'buddypress' ) );

				for ( $i = 1; $i < 32; ++$i ) {
					$html .= sprintf( '<option value="%1$s" %2$s>%3$s</option>', (int) $i, selected( $day, $i, false ), (int) $i );
				}
			break;

			case 'month':
				$eng_months = array( 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December' );

				$months = array(
					__( 'January', 'buddypress' ),
					__( 'February', 'buddypress' ),
					__( 'March', 'buddypress' ),
					__( 'April', 'buddypress' ),
					__( 'May', 'buddypress' ),
					__( 'June', 'buddypress' ),
					__( 'July', 'buddypress' ),
					__( 'August', 'buddypress' ),
					__( 'September', 'buddypress' ),
					__( 'October', 'buddypress' ),
					__( 'November', 'buddypress' ),
					__( 'December', 'buddypress' )
				);

				$html = sprintf( '<option value="" %1$s>%2$s</option>', selected( $month, 0, false ), /* translators: no option picked in select box */ __( '----', 'buddypress' ) );

				for ( $i = 0; $i < 12; ++$i ) {
					$html .= sprintf( '<option value="%1$s" %2$s>%3$s</option>', esc_attr( $eng_months[$i] ), selected( $month, $eng_months[$i], false ), $months[$i] );
				}
			break;

			case 'year':
				$html = sprintf( '<option value="" %1$s>%2$s</option>', selected( $year, 0, false ), /* translators: no option picked in select box */ __( '----', 'buddypress' ) );

				// You need to be +18 to use this 
				$mayoria_edad = date('Y') - 18;
				for ( $i = $mayoria_edad; $i > 1901; $i-- ) {
					$html .= sprintf( '<option value="%1$s" %2$s>%3$s</option>', (int) $i, selected( $year, $i, false ), (int) $i );
				}
			break;
		}

		echo apply_filters( 'bp_get_the_profile_field_datebox18', $html, $args['type'], $day, $month, $year, $this->field_obj->id, $date );
	}

	/**
	 * Output HTML for this field type on the wp-admin Profile Fields screen.
	 *
	 * Must be used inside the {@link bp_profile_fields()} template loop.
	 *
	 * @param array $raw_properties Optional key/value array of permitted attributes that you want to add.
	 * @since BuddyPress (2.0.0)
	 */
	public function admin_field_html( array $raw_properties = array() ) {
		$day_html = $this->get_edit_field_html_elements( array_merge(
			array(
				'id'   => bp_get_the_profile_field_input_name() . '_day',
				'name' => bp_get_the_profile_field_input_name() . '_day',
			),
			$raw_properties
		) );

		$month_html = $this->get_edit_field_html_elements( array_merge(
			array(
				'id'   => bp_get_the_profile_field_input_name() . '_month',
				'name' => bp_get_the_profile_field_input_name() . '_month',
			),
			$raw_properties
		) );

		$year_html = $this->get_edit_field_html_elements( array_merge(
			array(
				'id'   => bp_get_the_profile_field_input_name() . '_year',
				'name' => bp_get_the_profile_field_input_name() . '_year',
			),
			$raw_properties
		) );
	?>
		<select <?php echo $day_html; ?>>
			<?php bp_the_profile_field_options( 'type=day' ); ?>
		</select>

		<select <?php echo $month_html; ?>>
			<?php bp_the_profile_field_options( 'type=month' ); ?>
		</select>

		<select <?php echo $year_html; ?>>
			<?php bp_the_profile_field_options( 'type=year' ); ?>
		</select>
	<?php
	}

	/**
	 * This method usually outputs HTML for this field type's children options on the wp-admin Profile Fields
	 * "Add Field" and "Edit Field" screens, but for this field type, we don't want it, so it's stubbed out.
	 *
	 * @param BP_XProfile_Field $current_field The current profile field on the add/edit screen.
	 * @param string $control_type Optional. HTML input type used to render the current field's child options.
	 * @since BuddyPress (2.0.0)
	 */
	public function admin_new_field_html( BP_XProfile_Field $current_field, $control_type = '' ) {}
}