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wp-content/plugins/one-click-demo-import/inc/PluginInstallerSkinSilent.php

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+<?php
+/**
+ * Plugin Installer Skin class - responsible for not displying any info while installing plugins.
+ *
+ * @package ocdi
+ */
+
+namespace OCDI;
+
+if ( ! class_exists( '\Plugin_Upgrader', false ) ) {
+	require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+}
+
+/**
+ * WordPress class extended for on-the-fly plugin installations.
+ */
+class PluginInstallerSkinSilent extends \WP_Upgrader_Skin {
+
+	/**
+	 * Empty out the header of its HTML content.
+	 */
+	public function header() {}
+
+	/**
+	 * Empty out the footer of its HTML content.
+	 */
+	public function footer() {}
+
+	/**
+	 * Empty out the footer of its HTML content.
+	 *
+	 * @param string $string
+	 * @param mixed  ...$args Optional text replacements.
+	 */
+	public function feedback( $string, ...$args ) {}
+
+	/**
+	 * Empty out JavaScript output that calls function to decrement the update counts.
+	 *
+	 * @param string $type Type of update count to decrement.
+	 */
+	public function decrement_update_count( $type ) {}
+
+	/**
+	 * Empty out the error HTML content.
+	 *
+	 * @param string|WP_Error $errors A string or WP_Error object of the install error/s.
+	 */
+	public function error( $errors ) {}
+}
+