Filter to embed QR code field images into PDF fields

Fillable-PDFs-QR-Code.php

<?php

// Change the priority for Fillable PDFs.
remove_filter( 'gform_entry_post_save', array( fg_fillablepdfs(), 'maybe_process_feed' ), 10 );
add_filter( 'gform_entry_post_save', array( fg_fillablepdfs(), 'maybe_process_feed' ), 99, 2 );

/**
 * Embed generated QR Code into PDF field.
 *
 * @param array $pdf_meta PDF arguments.
 * @param array $feed     The feed object.
 * @param array $entry    The entry object.
 * @param array $form     The form object.
 *
 * @return array
 */
add_filter( 'fg_fillablepdfs_pdf_args', function( $args, $feed, $entry, $form ) {

	// If form does not have any QR Code fields, return.
	if ( ! GFAPI::get_fields_by_type( $form, 'qrcode' ) ) {
		return $args;
	}

	foreach ( rgars( $feed, 'meta/fieldMap', array() ) as $field_name => $meta ) {

		$field       = GFAPI::get_field( $form, $meta['field'] );
		$field_value = rgar( $entry, $meta['field'] );

		// If this PDF field is not mapped to a QR Code field, skip.
		if ( ! $field || $field->type !== 'qrcode' || empty( $field_value ) ) {
			continue;
		}

		// Get image URL, append "image_fill" modifier.
		$field_value = $field->get_value_entry_detail( $field_value, '', false, 'text' );
		$field_value = 'image_fill|' . $field_value;

		$args['field_values'][ $field_name ] = $field_value;

	}

	return $args;

}, 10, 4 );