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Filename : db-restore.php
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<?php
/**
 * Define database parameters here
 */
$upload_dir = wp_upload_dir();
$backup_dirname = $upload_dir['basedir'].'/wp-file-manager-pro/fm_backup';
define("BACKUP_DIR", $backup_dirname);
define("CHARSET", 'utf8');
define("DISABLE_FOREIGN_KEY_CHECKS", true);

/**
 * The Restore_Database class
 */
class Restore_Database {
    /**
     * Host where the database is located
     */
    var $host;

    /**
     * Username used to connect to database
     */
    var $username;

    /**
     * Password used to connect to database
     */
    var $passwd;

    /**
     * Database to backup
     */
    var $dbName;

    /**
     * Database charset
     */
    var $charset;

    /**
     * Database connection
     */
    var $conn;

    /**
     * Disable foreign key checks
     */
    var $disableForeignKeyChecks;

    /**
     * Constructor initializes database
     */
    function __construct($filename) {
        $this->host                    = DB_HOST;
        $this->username                = DB_USER;
        $this->passwd                  = DB_PASSWORD;
        $this->dbName                  = DB_NAME;
        $this->charset                 = DB_CHARSET;
        $this->disableForeignKeyChecks = defined('DISABLE_FOREIGN_KEY_CHECKS') ? DISABLE_FOREIGN_KEY_CHECKS : true;
        $this->conn                    = $this->initializeDatabase();
        $this->backupDir               = defined('BACKUP_DIR') ? BACKUP_DIR : '.';
        $this->backupFile              = $filename;
    }

    /**
     * Destructor re-enables foreign key checks
     */
    function __destructor() {
        /**
         * Re-enable foreign key checks 
         */
        if ($this->disableForeignKeyChecks === true) {
            mysqli_query($this->conn, 'SET foreign_key_checks = 1');
        }
    }

    protected function initializeDatabase() {
        try {
            $conn = mysqli_connect($this->host, $this->username, $this->passwd, $this->dbName);
            if (mysqli_connect_errno()) {
                throw new Exception('ERROR connecting database: ' . mysqli_connect_error());
                die();
            }
            if (!mysqli_set_charset($conn, $this->charset)) {
                mysqli_query($conn, 'SET NAMES '.$this->charset);
            }

            /**
             * Disable foreign key checks 
             */
            if ($this->disableForeignKeyChecks === true) {
                mysqli_query($conn, 'SET foreign_key_checks = 0');
            }

        } catch (Exception $e) {
            print_r($e->getMessage());
            die();
        }

        return $conn;
    }

    /**
     * Backup the whole database or just some tables
     * Use '*' for whole database or 'table1 table2 table3...'
     * @param string $tables
     */
    public function restoreDb() {
        try {
            $sql = '';
            $multiLineComment = false;

            $backupDir = $this->backupDir;
            $backupFile = $this->backupFile;

            /**
             * Gunzip file if gzipped
             */
            $backupFileIsGzipped = substr($backupFile, -3, 3) == '.gz' ? true : false;
          
            if ($backupFileIsGzipped) {
                if (!$backupFile = $this->gunzipBackupFile()) {
                    throw new Exception("ERROR: couldn't gunzip backup file " . $backupDir . '/' . $backupFile);
                }
            }

            /**
            * Read backup file line by line
            */
            $handle = fopen($backupDir . '/' . $backupFile, "r");
            if ($handle) {
                while (($line = fgets($handle)) !== false) {
                    $line = ltrim(rtrim($line));
                    if (strlen($line) > 1) { // avoid blank lines
                        $lineIsComment = false;
                        if (preg_match('/^\/\*/', $line)) {
                            $multiLineComment = true;
                            $lineIsComment = true;
                        }
                        if ($multiLineComment or preg_match('/^\/\//', $line)) {
                            $lineIsComment = true;
                        }
                        if (!$lineIsComment) {
                            $sql .= $line;
                            if (preg_match('/;$/', $line)) {
                                
                                mysqli_query($this->conn, "SET sql_mode = ''");
                                // execute query
                                if(mysqli_query($this->conn, $sql)) {
                                    if (preg_match('/^CREATE TABLE `([^`]+)`/i', $sql, $tableName)) {
                                        $this->obfPrint("Table succesfully created: `" . $tableName[1] . "`");
                                    }
                                    $sql = '';
                                } else {
                                    throw new Exception("ERROR: SQL execution error: " . mysqli_error($this->conn));
                                }
                            }
                        } else if (preg_match('/\*\/$/', $line)) {
                            $multiLineComment = false;
                        }
                    }
                }
                fclose($handle);
            } else {
                throw new Exception("ERROR: couldn't open backup file " . $backupDir . '/' . $backupFile);
            } 
        } catch (Exception $e) {
            print_r($e->getMessage());
            return false;
        }

        if ($backupFileIsGzipped) {
            unlink($backupDir . '/' . $backupFile);
        }
        return true;
    }

    /*
     * Gunzip backup file
     *
     * @return string New filename (without .gz appended and without backup directory) if success, or false if operation fails
     */
    protected function gunzipBackupFile() {
        // Raising this value may increase performance
        $bufferSize = 4096; // read 4kb at a time
        $error = false;

        $source = $this->backupDir . '/' . $this->backupFile;
        $dest = $this->backupDir . '/' . date("Ymd_His", time()) . '_' . substr($this->backupFile, 0, -3);

        $this->obfPrint('Gunzipping backup file ' . $source . '... ', 1, 1);

        // Remove $dest file if exists
        if (file_exists($dest)) {
            if (!unlink($dest)) {
                return false;
            }
        }
        
        // Open gzipped and destination files in binary mode
        if (!$srcFile = gzopen($this->backupDir . '/' . $this->backupFile, 'rb')) {
            return false;
        }
        if (!$dstFile = fopen($dest, 'wb')) {
            return false;
        }

        while (!gzeof($srcFile)) {
            // Read buffer-size bytes
            // Both fwrite and gzread are binary-safe
            if(!fwrite($dstFile, gzread($srcFile, $bufferSize))) {
                return false;
            }
        }

        fclose($dstFile);
        gzclose($srcFile);

        // Return backup filename excluding backup directory
        return str_replace($this->backupDir . '/', '', $dest);
    }

    /**
     * Prints message forcing output buffer flush
     *
     */
    public function obfPrint ($msg = '', $lineBreaksBefore = 0, $lineBreaksAfter = 1) {
        if (!$msg) {
            return false;
        }

        $msg = date("Y-m-d H:i:s") . ' - ' . $msg;
        $output = '';

        if (php_sapi_name() != "cli") {
            $lineBreak = "<br />";
        } else {
            $lineBreak = "\n";
        }

        if ($lineBreaksBefore > 0) {
            for ($i = 1; $i <= $lineBreaksBefore; $i++) {
                $output .= $lineBreak;
            }                
        }

        $output .= $msg;

        if ($lineBreaksAfter > 0) {
            for ($i = 1; $i <= $lineBreaksAfter; $i++) {
                $output .= $lineBreak;
            }                
        }

        if (php_sapi_name() == "cli") {
            $output .= "\n";
        }

        if (php_sapi_name() != "cli") {
            ob_flush();
        }

        flush();
    }
}