installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/inc/options/parts/redis_extension.php

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+<?php
+/**
+ * File: redis_extension.php
+ *
+ * @package W3TC
+ */
+
+namespace W3TC;
+
+if ( ! defined( 'W3TC' ) ) {
+	die();
+}
+
+/*
+ * Requires $module variable
+ */
+$config = Dispatcher::config();
+
+?>
+<tr>
+	<th><label for="redis_servers"><?php echo wp_kses( Util_ConfigLabel::get( 'redis.servers' ), array( 'acronym' => array( 'title' => array() ) ) ); ?></label></th>
+	<td>
+		<input id="redis_servers" type="text"
+			name="<?php echo esc_attr( $module ); ?>___redis__servers"
+			<?php Util_Ui::sealing_disabled( $module ); ?>
+			value="<?php echo esc_attr( implode( ',', $config->get_array( array( $module, 'redis.servers' ) ) ) ); ?>"
+			size="100" />
+		<input class="w3tc_common_redis_test button {nonce: '<?php echo esc_attr( wp_create_nonce( 'w3tc' ) ); ?>'}"
+			<?php Util_Ui::sealing_disabled( $module ); ?>
+			type="button" value="<?php esc_attr_e( 'Test', 'w3-total-cache' ); ?>" />
+		<span class="w3tc_common_redis_test_result w3tc-status w3tc-process"></span>
+		<p class="description"><?php esc_html_e( 'Multiple servers may be used and seperated by a comma; e.g. 192.168.1.100:11211, domain.com:22122. To use TLS, prefix server with tls://', 'w3-total-cache' ); ?></p>
+	</td>
+</tr>
+<?php
+
+Util_Ui::config_item(
+	array(
+		'key'            => array( $module, 'redis.verify_tls_certificates' ),
+		'label'          => Util_ConfigLabel::get( 'redis.verify_tls_certificates' ),
+		'control'        => 'checkbox',
+		'checkbox_label' => Util_ConfigLabel::get( 'redis.verify_tls_certificates' ),
+		'description'    => __( 'Verify the server\'s certificate when connecting via TLS.', 'w3-total-cache' ),
+	)
+);
+
+Util_Ui::config_item(
+	array(
+		'key'            => array( $module, 'redis.persistent' ),
+		'label'          => __( 'Use persistent connection:', 'w3-total-cache' ),
+		'control'        => 'checkbox',
+		'checkbox_label' => Util_ConfigLabel::get( 'redis.persistent' ),
+		'description'    => __( 'Using persistent connection doesn\'t reinitialize memcached driver on each request', 'w3-total-cache' ),
+	)
+);
+
+Util_Ui::config_item(
+	array(
+		'key'          => array( $module, 'redis.timeout' ),
+		'label'        => Util_ConfigLabel::get( 'redis.timeout' ),
+		'control'      => 'textbox',
+		'textbox_type' => 'number',
+		'description'  => __( 'In seconds', 'w3-total-cache' ),
+	)
+);
+
+Util_Ui::config_item(
+	array(
+		'key'          => array( $module, 'redis.retry_interval' ),
+		'label'        => Util_ConfigLabel::get( 'redis.retry_interval' ),
+		'control'      => 'textbox',
+		'textbox_type' => 'number',
+		'description'  => __( 'In miliseconds', 'w3-total-cache' ),
+	)
+);
+
+if ( version_compare( phpversion( 'redis' ), '5', '>=' ) ) {
+	// PHP Redis 5 supports the read_timeout setting.
+	Util_Ui::config_item(
+		array(
+			'key'          => array( $module, 'redis.read_timeout' ),
+			'label'        => Util_ConfigLabel::get( 'redis.read_timeout' ),
+			'control'      => 'textbox',
+			'textbox_type' => 'number',
+			'description'  => __( 'In seconds', 'w3-total-cache' ),
+		)
+	);
+}
+
+Util_Ui::config_item(
+	array(
+		'key'         => array( $module, 'redis.dbid' ),
+		'label'       => Util_ConfigLabel::get( 'redis.dbid' ),
+		'control'     => 'textbox',
+		'description' => __( 'Database ID to use', 'w3-total-cache' ),
+	)
+);
+
+Util_Ui::config_item(
+	array(
+		'key'         => array( $module, 'redis.password' ),
+		'label'       => Util_ConfigLabel::get( 'redis.password' ),
+		'control'     => 'textbox',
+		'description' => __( 'Specify redis password', 'w3-total-cache' ),
+	)
+);