field-list-csv.php

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<?php
/**
 * The default list field output template.
 *
 * @global \GV\Template_Context $gravityview
 * @since 2.0
 */

if ( ! isset( $gravityview ) || empty( $gravityview->template ) ) {
    gravityview()->log->error( '{file} template loaded without context', array( 'file' => __FILE__ ) );
    return;
}

$field_id = $gravityview->field->ID;
$field = $gravityview->field->field;
$value = $gravityview->value;
$display_value = $gravityview->display_value;

$column_id = gravityview_get_input_id_from_id( $field_id );

if ( $field->enableColumns && false !== $column_id ) {

    /**
     * @filter `gravityview/fields/list/column-format` Format of single list column output of a List field with Multiple Columns enabled
     * @since 1.14
     * @param string $format `html` (for <ul> list), `text` (for CSV output)
     * @since 2.0
     * @param \GV\Template_Context $gravityview The context
     */
    $format = apply_filters( 'gravityview/fields/list/column-format', 'text', $gravityview );

    echo GravityView_Field_List::column_value( $field, $value, $column_id, $format );

} else {

    /**
     * @filter `gravityview/template/field/csv/glue` The value used to separate multiple values in the CSV export
     * @since 2.4.2
     *
     * @param string The glue. Default: ";" (semicolon)
     * @param \GV\Template_Context The context.
     */
    $glue = apply_filters( 'gravityview/template/field/csv/glue', ";", $gravityview );

    $value = unserialize( $value );
    if ( $field->enableColumns ) {
        $columns = array_keys( current( $value ) );
        echo implode( ',', $columns ) . $glue;
    }

    $output = array();
    foreach ( $value as $column ) {
        $output[] = is_array($column) ? implode( ',', $column ) : $column;
    }

    echo implode( $glue, $output );
}