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<?php

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namespace Nextend\WordPress;

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use Nextend\Framework\Pattern\SingletonTrait;

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class OutputBuffer {

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use SingletonTrait;

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protected $priority = 100;

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protected $extraObStart = 0;

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protected function init() {

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add_action('init', array(

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$this,

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'onInit'

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), $this->priority);

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add_action('shutdown', array(

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$this,

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'closeOutputBuffers'

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), -1 * $this->priority);

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/**

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* Fix for KeyCDN cache enabled

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* @url https://wordpress.org/plugins/cache-enabler/

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if (class_exists('Cache_Enabler', false)) {

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add_action('template_redirect', function () {

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ob_start(array(

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$this,

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"outputCallback"

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));

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}, 0);

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}

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/**

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* Fix for Hyper Cache

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* @url https://wordpress.org/plugins/hyper-cache/

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if (function_exists('hyper_cache_callback')) {

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add_filter('cache_buffer', array(

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$this,

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'prepareOutput'

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));

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}

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/**

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* Fix for Speed booster Pack

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* @url https://wordpress.org/plugins/speed-booster-pack/

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if (defined('SBP_VERSION')) {

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add_filter('sbp_output_buffer', array(

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$this,

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'prepareOutput'

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));

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}

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if (class_exists('PagespeedNinja')) {

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/**

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* @see SSDEV-2358

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add_action('template_redirect', function () {

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ob_start(array(

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$this,

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"outputCallback"

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));

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});

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}

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if (class_exists('Cachify')) {

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/**

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* @see SSDEV-2776

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add_action('template_redirect', function () {

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ob_start(array(

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$this,

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"outputCallback"

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));

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});

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}

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if (class_exists('Ionos\Performance\Caching')) {

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/**

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* @see SSDEV-3780

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add_action('template_redirect', function () {

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ob_start(array(

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$this,

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"outputCallback"

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));

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});

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}

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if (class_exists('WP_Grid_Builder\Autoload')) {

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/**

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* @see SSDEV-3888

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add_action('template_redirect', function () {

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ob_start(array(

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$this,

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"outputCallback"

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));

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});

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}

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if (class_exists('wps_ic')) {

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/**

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* @see SSDEV-3916

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add_action('template_redirect', function () {

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ob_start(array(

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$this,

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"outputCallback"

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));

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});

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}

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}

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/**

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* Theme's functions.php loaded at this point.

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public function onInit() {

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/**

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* Borlabs cache

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* @url https://borlabs.io/download/

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if (defined('BORLABS_CACHE_SLUG') && !is_admin()) {

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add_action('template_redirect', array(

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$this,

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'outputStart'

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), -1 * $this->priority);

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return;

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}

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if (defined('THEMIFY_VERSION') && !is_admin()) {

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add_filter('template_include', array(

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$this,

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'templateIncludeOutputStart'

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), 1); // Themify use priority: 0

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return;

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}

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add_action('pp_end_html', array(

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$this,

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'closeOutputBuffers'

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), -10000); // ProPhoto 6 theme: we must close the buffer before the cache

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add_action('headway_html_close', array(

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$this,

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'closeOutputBuffers'

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), $this->priority); // Headway theme

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$this->outputStart();

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}

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public function templateIncludeOutputStart($template) {

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$this->outputStart();

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return $template;

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}

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public function outputStart() {

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static $started = false;

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if ($started) {

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return true;

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}

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$started = true;

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if (defined('AUTOPTIMIZE_PLUGIN_DIR')) {

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add_filter('autoptimize_filter_html_before_minify', array(

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$this,

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'prepareOutput'

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));

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}

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if (defined('WP_ROCKET_VERSION')) {

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add_filter('rocket_buffer', array(

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$this,

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'prepareOutput'

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), -100000);

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}

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/**

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* Gantry 4 improvement to use the inbuilt output filter

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if (defined('GANTRY_VERSION') && version_compare(GANTRY_VERSION, '4.0.0', '>=') && version_compare(GANTRY_VERSION, '5.0.0', '<')) {

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if (!is_admin()) {

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add_filter('gantry_before_render_output', array(

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$this,

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'prepareOutput'

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));

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remove_action('shutdown', array(

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$this,

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'closeOutputBuffers'

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), -1 * $this->priority);

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return true;

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}

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}

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ob_start(array(

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$this,

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"outputCallback"

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));

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for ($i = 0; $i < $this->extraObStart; $i++) {

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ob_start();

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}

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/**

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* Ultimate reviews open a buffer on init and tries to close it on wp_footer.

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* To prevent that, lets open a new buffer which can be closed on wp_footer.

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* @bug install Speed Contact Bar + Ultimate Reviews

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* @see https://wordpress.org/plugins/ultimate-reviews/

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if (function_exists('EWD_URP_add_ob_start')) {

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ob_start();

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}

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/**

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* Cart66 closes our output buffer in forceDownload method

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* @url http://www.cart66.com

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if (class_exists('Cart66')) {

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ob_start();

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}

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return true;

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}

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public function closeOutputBuffers() {

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if (!defined('WC_DOING_AJAX') || !WC_DOING_AJAX) {

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$handlers = ob_list_handlers();

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$callback = self::class . '::outputCallback';

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if (in_array($callback, $handlers)) {

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for ($i = count($handlers) - 1; $i >= 0; $i--) {

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ob_end_flush();

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if ($handlers[$i] === $callback) {

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break;

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}

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}

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}

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}

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}

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public function outputCallback($buffer, $phase) {

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if ($phase & PHP_OUTPUT_HANDLER_FINAL || $phase & PHP_OUTPUT_HANDLER_END) {

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return $this->prepareOutput($buffer);

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}

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return $buffer;

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}

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public function prepareOutput($buffer) {

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return apply_filters('wordpress_prepare_output', $buffer);

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}

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/**

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* @param int $priority

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public function setPriority($priority) {

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$this->priority = $priority;

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}

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/**

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* @param int $extraObStart

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public function setExtraObStart($extraObStart) {

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$this->extraObStart = $extraObStart;

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}

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}

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