combined-snippet.php

<?php
add_action( 'gform_after_update_entry', function ( $form, $entry_id ) {
	$gppa_lmt = GP_Populate_Anything_Live_Merge_Tags::get_instance();
	$entry    = GFAPI::get_entry( $entry_id );
	foreach ( $form['fields'] as $field ) {
		// For any field having Live Merge Tags.
		if ( $gppa_lmt->has_live_merge_tag( $field->defaultValue ) ) {
			$gppa_lmt->populate_lmt_whitelist( $form );
			remove_all_filters('gform_pre_replace_merge_tags');

			// Process the Live Merge Tags.
			$merge_tag = preg_replace( '/@(?=\{)/', '', $field->defaultValue );
			$value     = GFCommon::replace_variables( $merge_tag, $form, $entry );
			$instance  = new GW_Format_Date_Merge_Tag();
			$value     = $instance->replace_merge_tags( $merge_tag, $form, $entry, false, false, false, 'text' );
			GFFormsModel::update_entry_field_value( $form, $entry, $field, '', $field->id, $value );
		}
	}
}, 15, 2 );



class GW_Format_Date_Merge_Tag {

	private $_args = array();

	public function __construct( $args = array() ) {

		// set our default arguments, parse against the provided arguments, and store for use throughout the class
		$this->_args = wp_parse_args( $args, array(
			'form_id'  => false,
			'field_id' => false,
			'locale'   => null,
		) );

		// do version check in the init to make sure if GF is going to be loaded, it is already loaded
		add_action( 'init', array( $this, 'init' ) );
	}

	public function init() {
		add_filter( 'gform_pre_replace_merge_tags', array( $this, 'replace_merge_tags' ), 10, 7 );
	}

	public function replace_merge_tags( $text, $form, $entry, $url_encode, $esc_html, $nl2br, $format ) {
		if ( ! $this->is_applicable_form( $form ) ) {
			return $text;
		}

		$current_locale = determine_locale();
		$locale         = $this->_args['locale'];
		if ( $locale ) {
			switch_to_locale( $locale );
		}

		preg_match_all( '/{[^{]*?:(\d+(\.\d+)?)(:(.*?))?}/mi', $text, $matches, PREG_SET_ORDER );

		foreach ( $matches as $match ) {

			$input_id = $match[1];
			$field    = GFFormsModel::get_field( $form, $input_id );

			if ( ! $field || $field->get_input_type() !== 'date' ) {
				continue;
			}

			$i        = $match[0][0] === '{' ? 4 : 5;
			$modifier = rgar( array_map( 'trim', explode( ',', rgar( $match, $i ) ) ), 0 );
			if ( ! $modifier ) {
				continue;
			}

			$value = GFFormsModel::get_lead_field_value( $entry, $field );
			$value = $field->get_value_merge_tag( $value, $input_id, $entry, $form, $modifier, $value, $url_encode, $esc_html, $format, $nl2br );
			if ( ! $value ) {
				continue;
			}

			$format      = $field->dateFormat ? $field->dateFormat : 'mdy';
			$parsed_date = GFCommon::parse_date( $value, $format );

			// On the Notifications/Confirmation side, & gets encoded to &amp;. Decode it back.
			$modifier = htmlspecialchars_decode( $modifier );

			// For whatever reason, Populate Anything's LMTs works better with `&comma` than `&#44;`. But... date() doesn't
			// like it so let's replace it before we pass it to date().
			$modifier = str_replace( '&comma;', ',', $modifier );

			$timestamp = strtotime( sprintf( '%d-%d-%d', $parsed_date['year'], $parsed_date['month'], $parsed_date['day'] ) );

			// phpcs:ignore WordPress.DateTime.RestrictedFunctions.date_date
			$replace = wp_date( $modifier, $timestamp, new DateTimeZone( 'UTC' ) );

			$text = str_replace( $match[0], $replace, $text );
		}

		// Switch back to default locale.
		if ( $locale ) {
			switch_to_locale( $current_locale );
		}

		return $text;
	}

	public function is_applicable_form( $form ) {
		$form_id = isset( $form['id'] ) ? $form['id'] : $form;

		return empty( $this->_args['form_id'] ) || (int) $form_id === (int) $this->_args['form_id'];
	}
}

# Configuration

new GW_Format_Date_Merge_Tag();