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✏️ Editing: OutputBuffering.php

<?php
/**
 * Output buffering wrapper
 */

declare(strict_types=1);

namespace PhpMyAdmin;

use function defined;
use function flush;
use function function_exists;
use function header;
use function ini_get;
use function ob_end_clean;
use function ob_flush;
use function ob_get_contents;
use function ob_get_length;
use function ob_get_level;
use function ob_get_status;
use function ob_start;
use function register_shutdown_function;
use function sprintf;

/**
 * Output buffering wrapper class
 */
class OutputBuffering
{
    /** @var self */
    private static $instance;

/** @var int */
    private $mode;

/** @var string */
    private $content;

/** @var bool */
    private $on;

/**
     * Initializes class
     */
    private function __construct()
    {
        $this->mode = $this->getMode();
        $this->on = false;
    }

/**
     * This function could be used eventually to support more modes.
     *
     * @return int the output buffer mode
     */
    private function getMode()
    {
        $mode = 0;
        if ($GLOBALS['cfg']['OBGzip'] && function_exists('ob_start')) {
            if (ini_get('output_handler') === 'ob_gzhandler') {
                // If a user sets the output_handler in php.ini to ob_gzhandler, then
                // any right frame file in phpMyAdmin will not be handled properly by
                // the browser. My fix was to check the ini file within the
                // PMA_outBufferModeGet() function.
                $mode = 0;
            } elseif (function_exists('ob_get_level') && ob_get_level() > 0) {
                // happens when php.ini's output_buffering is not Off
                ob_end_clean();
                $mode = 1;
            } else {
                $mode = 1;
            }
        }

// Zero (0) is no mode or in other words output buffering is OFF.
        // Follow 2^0, 2^1, 2^2, 2^3 type values for the modes.
        // Useful if we ever decide to combine modes.  Then a bitmask field of
        // the sum of all modes will be the natural choice.
        return $mode;
    }

/**
     * Returns the singleton OutputBuffering object
     *
     * @return OutputBuffering object
     */
    public static function getInstance()
    {
        if (empty(self::$instance)) {
            self::$instance = new OutputBuffering();
        }

return self::$instance;
    }

/**
     * This function will need to run at the top of all pages if output
     * output buffering is turned on.  It also needs to be passed $mode from
     * the PMA_outBufferModeGet() function or it will be useless.
     */
    public function start(): void
    {
        if ($this->on) {
            return;
        }

if ($this->mode && function_exists('ob_gzhandler')) {
            ob_start('ob_gzhandler');
        }

ob_start();
        $this->sendHeader('X-ob_mode', (string) $this->mode);

register_shutdown_function(
            [
                self::class,
                'stop',
            ]
        );
        $this->on = true;
    }

private function sendHeader(string $name, string $value): void
    {
        if (defined('TESTSUITE')) {
            return;
        }

header(sprintf('%s: %s', $name, $value));
    }

/**
     * This function will need to run at the bottom of all pages if output
     * buffering is turned on.  It also needs to be passed $mode from the
     * PMA_outBufferModeGet() function or it will be useless.
     */
    public static function stop(): void
    {
        $buffer = self::getInstance();
        if (! $buffer->on) {
            return;
        }

$buffer->on = false;
        $buffer->content = ob_get_contents();
        if (ob_get_length() <= 0) {
            return;
        }

ob_end_clean();
    }

/**
     * Gets buffer content
     *
     * @return string buffer content
     */
    public function getContents()
    {
        return $this->content;
    }

/**
     * Flushes output buffer
     */
    public function flush(): void
    {
        if (ob_get_status() && $this->mode) {
            ob_flush();
        } else {
            flush();
        }
    }
}

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