installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/extension-example/Extension_Example_Page_View.php

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+<?php
+namespace W3TCExample;
+
+if ( ! defined( 'W3TC' ) ) {
+	die();
+}
+?>
+<p>
+	<?php esc_html_e( 'Jump to:', 'w3-total-cache' ); ?>
+	<a href="admin.php?page=w3tc_general"><?php esc_html_e( 'Main Menu', 'w3-total-cache' ); ?></a> |
+	<a href="admin.php?page=w3tc_extensions"><?php esc_html_e( 'Extensions', 'w3-total-cache' ); ?></a>
+</p>
+<p><?php esc_html_e( 'Example extension is currently ', 'w3-total-cache' ); ?><span class="w3tc-enabled"><?php esc_html_e( 'enabled', 'w3-total-cache' ); ?></span></p>
+
+<div class="metabox-holder">
+<?php
+// render settings box header.
+\W3TC\Util_Ui::postbox_header( 'Example extension' );
+?>
+<table class="form-table">
+	<?php
+	// render controls showing content of w3tc configuration options.
+	\W3TC\Util_Ui::config_item(
+		array(
+			'key'            => array( 'example', 'is_title_postfix' ),
+			'control'        => 'checkbox',
+			'label'          => __( 'Add postfix to page titles', 'w3-total-cache' ),
+			'checkbox_label' => __( 'Enable', 'w3-total-cache' ),
+			'description'    => __( 'Check if you want to add postfix to each post title.', 'w3-total-cache' ),
+		)
+	);
+	\W3TC\Util_Ui::config_item(
+		array(
+			'key'     => array( 'example', 'title_postfix' ),
+			'control' => 'textbox',
+			'label'   => __( 'Postfix to page titles', 'w3-total-cache' ),
+		)
+	);
+	?>
+</table>
+<?php
+// render save button for ::config_item controls.
+\W3TC\Util_Ui::button_config_save( 'extension_example' );
+// render settings box footer.
+\W3TC\Util_Ui::postbox_footer();
+?>
+</div>