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wp-content/plugins/popup-maker/classes/Interface/CSV/Exporter.php

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+<?php
+/**
+ * Interface for CSV Exporter
+ *
+ * @package   PUM
+ * @copyright Copyright (c) 2023, Code Atlantic LLC
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Promise for structuring CSV exporters.
+ *
+ * @since  1.7.0
+ */
+interface PUM_Interface_CSV_Exporter extends PUM_Interface_Batch_Exporter {
+
+	/**
+	 * Sets the CSV columns.
+	 *
+	 * @return array<string,string> CSV columns.
+	 */
+	public function csv_cols();
+
+	/**
+	 * Retrieves the CSV columns array.
+	 *
+	 * Alias for csv_cols(), usually used to implement a filter on the return.
+	 *
+	 * @return array<string,string> CSV columns.
+	 */
+	public function get_csv_cols();
+
+	/**
+	 * Outputs the CSV columns.
+	 *
+	 * @return void
+	 */
+	public function csv_cols_out();
+
+	/**
+	 * Outputs the CSV rows.
+	 *
+	 * @return void
+	 */
+	public function csv_rows_out();
+
+}

wp-content/plugins/popup-maker/classes/Interface/CSV/Importer.php

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+<?php
+/**
+ * Interface for CSV Importer
+ *
+ * @package   PUM
+ * @copyright Copyright (c) 2023, Code Atlantic LLC
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Promise for structuring CSV importers.
+ *
+ * @since  1.7.0
+ *
+ * @see PUM_Interface_Batch_Importer
+ */
+interface PUM_Interface_CSV_Importer extends PUM_Interface_Batch_Importer {
+
+	/**
+	 * Maps CSV columns to their corresponding import fields.
+	 *
+	 * @param array $import_fields Import fields to map.
+	 */
+	public function map_fields( $import_fields = [] );
+
+	/**
+	 * Retrieves the CSV columns.
+	 *
+	 * @return array The columns in the CSV.
+	 */
+	public function get_columns();
+
+	/**
+	 * Maps a single CSV row to the data passed in via init().
+	 *
+	 * @param array $csv_row CSV row data.
+	 *
+	 * @return array CSV row data mapped to form-defined arguments.
+	 */
+	public function map_row( $csv_row );
+
+	/**
+	 * Retrieves the first row of the CSV.
+	 *
+	 * This is used for showing an example of what the import will look like.
+	 *
+	 * @return array The first row after the header of the CSV.
+	 */
+	public function get_first_row();
+
+}