installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/Cdnfsd_StackPath_Popup_View_Zones.php

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+<?php
+namespace W3TC;
+
+if ( ! defined( 'W3TC' ) ) {
+	die();
+}
+?>
+<form class="w3tc_popup_form" method="post">
+	<?php Util_Ui::hidden( '', 'api_key', $details['api_key'] ); ?>
+	<div class="metabox-holder">
+		<?php Util_Ui::postbox_header( esc_html__( 'Select zone to use', 'w3-total-cache' ) ); ?>
+		<table class="form-table">
+			<tr>
+				<td>Zone:</td>
+				<td>
+					<?php
+					if ( count( $details['zones'] ) > 15 ) {
+						echo '<div style="width: 100%; height: 300px; overflow-y: scroll">';
+					}
+					?>
+					<?php foreach ( $details['zones'] as $zone ) : ?>
+						<label>
+							<input name="zone_id" type="radio" class="w3tc-ignore-change"
+								value="<?php echo esc_attr( $zone['id'] ); ?>" />
+							<?php echo esc_html( $zone['name'] ); ?>
+							(<?php echo esc_html( $zone['cdn_url'] ); ?>)
+						</label><br />
+					<?php endforeach; ?>
+					<label>
+						<input name="zone_id" type="radio" class="w3tc-ignore-change" value="" />
+						Add new zone:
+					</label>
+					<input name="zone_new_name" type="text" class="w3tc-ignore-change" />
+					<?php
+					if ( count( $details['zones'] ) > 15 ) {
+						echo '</div>';
+					}
+					?>
+				</td>
+			</tr>
+		</table>
+		<p class="submit">
+			<input type="button"
+				class="w3tc_cdn_stackpath_fsd_view_zone w3tc-button-save button-primary"
+				value="<?php esc_attr_e( 'Apply', 'w3-total-cache' ); ?>" />
+		</p>
+		<?php Util_Ui::postbox_footer(); ?>
+	</div>
+</form>