Result::setDefaultResultType() - Code Metrics - Inspection of "Merge branch 'master' of https://github.com/voku/s..." - voku/simple-mysqli - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Push — master ( ace86f...569799 )

by Lars
created 2018-06-18 22:10 UTC
Result::setDefaultResultType() B

↳ Parent: Result
Complexity

Conditions	5
Paths	2
Size

Total Lines	14
Code Lines	10
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	6
CRAP Score	5.0729
Importance

Changes	1
Bugs	0	Features	0
Metric	Value
dl	0
loc	14
ccs	6
cts	7
cp	0.8571
rs	8.8571
c	1
b	0
f	0
cc	5
eloc	10
nc	2
nop	1
crap	5.0729
<?php

declare(strict_types=1);

namespace voku\db;

use Arrayy\Arrayy;
use Symfony\Component\PropertyAccess\PropertyAccess;
use voku\helper\UTF8;

/**
 * Result: This class can handle the results from the "DB"-class.
 *
 * @package   voku\db
 */
final class Result implements \Countable, \SeekableIterator, \ArrayAccess
{

  const MYSQL_TYPE_BIT         = 16;
  const MYSQL_TYPE_BLOB        = 252;
  const MYSQL_TYPE_DATE        = 10;
  const MYSQL_TYPE_DATETIME    = 12;
  const MYSQL_TYPE_DECIMAL     = 0;
  const MYSQL_TYPE_DOUBLE      = 5;
  const MYSQL_TYPE_ENUM        = 247;
  const MYSQL_TYPE_FLOAT       = 4;
  const MYSQL_TYPE_GEOMETRY    = 255;
  const MYSQL_TYPE_INT24       = 9;
  const MYSQL_TYPE_JSON        = 245;
  const MYSQL_TYPE_LONG        = 3;
  const MYSQL_TYPE_LONGLONG    = 8;
  const MYSQL_TYPE_LONG_BLOB   = 251;
  const MYSQL_TYPE_MEDIUM_BLOB = 250;
  const MYSQL_TYPE_NEWDATE     = 14;
  const MYSQL_TYPE_NEWDECIMAL  = 246;
  const MYSQL_TYPE_NULL        = 6;
  const MYSQL_TYPE_SET         = 248;
  const MYSQL_TYPE_SHORT       = 2;
  const MYSQL_TYPE_STRING      = 254;
  const MYSQL_TYPE_TIME        = 11;
  const MYSQL_TYPE_TIMESTAMP   = 7;
  const MYSQL_TYPE_TINY        = 1;
  const MYSQL_TYPE_TINY_BLOB   = 249;
  const MYSQL_TYPE_VARCHAR     = 15;
  const MYSQL_TYPE_VAR_STRING  = 253;
  const MYSQL_TYPE_YEAR        = 13;

  const RESULT_TYPE_ARRAY  = 'array';
  const RESULT_TYPE_ARRAYY = 'Arrayy';
  const RESULT_TYPE_OBJECT = 'object';
  const RESULT_TYPE_YIELD  = 'yield';

  /**
   * @var int
   */
  public $num_rows;

  /**
   * @var string
   */
  public $sql;

  /**
   * @var \mysqli_result|\Doctrine\DBAL\Statement
   */
  private $_result;

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

  /**
   * @var \Closure|null
   */
  private $_mapper;

  /**
   * @var string
   */
  private $_default_result_type = self::RESULT_TYPE_OBJECT;

  /**
   * @var \mysqli_stmt|null
   */
  private $doctrineMySQLiStmt;

  /**
   * @var \Doctrine\DBAL\Driver\PDOStatement|null
   */
  private $doctrinePdoStmt;

  /**
   * Result constructor.
   *
   * @param string         $sql
   * @param \mysqli_result $result
   * @param \Closure       $mapper Optional callback mapper for the "fetchCallable()" method
   */
  public function __construct(string $sql, $result, \Closure $mapper = null)
  {
    $this->sql = $sql;

    if (
        !$result instanceof \mysqli_result
        &&
        !$result instanceof \Doctrine\DBAL\Statement
    ) {
      throw new \InvalidArgumentException('$result must be ' . \mysqli_result::class . ' or ' . \Doctrine\DBAL\Statement::class . ' !');
    }

    $this->_result = $result;

    if ($this->_result instanceof \Doctrine\DBAL\Statement) {

      $doctrineDriver = $this->_result->getWrappedStatement();

      if ($doctrineDriver instanceof \Doctrine\DBAL\Driver\PDOStatement) {
        $this->doctrinePdoStmt = $doctrineDriver;
      } // try to get the mysqli driver from doctrine
      elseif ($doctrineDriver instanceof \Doctrine\DBAL\Driver\Mysqli\MysqliStatement) {
        $reflectionTmp = new \ReflectionClass($doctrineDriver);
        $propertyTmp = $reflectionTmp->getProperty('_stmt');
        $propertyTmp->setAccessible(true);
        $this->doctrineMySQLiStmt = $propertyTmp->getValue($doctrineDriver);
      }

      $this->num_rows = $this->_result->rowCount();
    } else {
      $this->num_rows = (int)$this->_result->num_rows;
    }

    $this->current_row = 0;


    $this->_mapper = $mapper;
  }

  /**
   * __destruct
   */
  public function __destruct()
  {
    $this->free();
  }

  /**
   * Runs a user-provided callback with the MySQLi_Result object given as
   * argument and returns the result, or returns the MySQLi_Result object if
   * called without an argument.
   *
   * @param callable $callback User-provided callback (optional)
   *
   * @return mixed|\Doctrine\DBAL\Statement|\mysqli_result
   */
  public function __invoke(callable $callback = null)
  {
    if (null !== $callback) {
      return $callback($this->_result);
    }

    return $this->_result;
  }

  /**
   * Get the current "num_rows" as string.
   *
   * @return string
   */
  public function __toString()
  {
    return (string)$this->num_rows;
  }

  /**
   * Cast data into int, float or string.
   *
   * <p>
   *   <br />
   *   INFO: install / use "mysqlnd"-driver for better performance
   * </p>
   *
   * @param array|object $data
   *
   * @return array|object|false <p><strong>false</strong> on error</p>
   */
  private function cast(&$data)
  {
    if (
        !$this->doctrinePdoStmt // pdo only have limited support for types, so we try to improve it
        &&
        Helper::isMysqlndIsUsed() === true
    ) {
      return $data;
    }

    // init
    static $FIELDS_CACHE = [];
    static $TYPES_CACHE = [];

    $result_hash = \spl_object_hash($this->_result);

    if (!isset($FIELDS_CACHE[$result_hash])) {
      $FIELDS_CACHE[$result_hash] = $this->fetch_fields();
    }

    if (
        !isset($FIELDS_CACHE[$result_hash])
        ||
        $FIELDS_CACHE[$result_hash] === false
    ) {
      return false;
    }

    if (!isset($TYPES_CACHE[$result_hash])) {
      foreach ($FIELDS_CACHE[$result_hash] as $field) {
        switch ($field->type) {
          case self::MYSQL_TYPE_BIT:
            $TYPES_CACHE[$result_hash][$field->name] = 'boolean';
            break;
          case self::MYSQL_TYPE_TINY:
          case self::MYSQL_TYPE_SHORT:
          case self::MYSQL_TYPE_LONG:
          case self::MYSQL_TYPE_LONGLONG:
          case self::MYSQL_TYPE_INT24:
            $TYPES_CACHE[$result_hash][$field->name] = 'integer';
            break;
          case self::MYSQL_TYPE_DOUBLE:
          case self::MYSQL_TYPE_DECIMAL:
          case self::MYSQL_TYPE_NEWDECIMAL:
          case self::MYSQL_TYPE_FLOAT:
            $TYPES_CACHE[$result_hash][$field->name] = 'float';
            break;
          default:
            $TYPES_CACHE[$result_hash][$field->name] = 'string';
            break;
        }
      }
    }

    if (\is_array($data) === true) {
      foreach ($TYPES_CACHE[$result_hash] as $type_name => $type) {
        if (isset($data[$type_name])) {
          \settype($data[$type_name], $type);
        }
      }
    } elseif (\is_object($data)) {
      foreach ($TYPES_CACHE[$result_hash] as $type_name => $type) {
        if (isset($data->{$type_name})) {
          \settype($data->{$type_name}, $type);
        }
      }
    }

    return $data;
  }

  /**
   * Countable interface implementation.
   *
   * @return int The number of rows in the result
   */
  public function count(): int
  {
    return $this->num_rows;
  }

  /**
   * Iterator interface implementation.
   *
   * @return mixed The current element
   */
  public function current()
  {
    return $this->fetchCallable($this->current_row);
  }

  /**
   * Iterator interface implementation.
   *
   * @return int The current element key (row index; zero-based)
   */
  public function key(): int
  {
    return $this->current_row;
  }

  /**
   * Iterator interface implementation.
   *
   * @return void
   */
  public function next()
  {
    $this->current_row++;
  }

  /**
   * Iterator interface implementation.
   *
   * @param int $row Row position to rewind to; defaults to 0
   *
   * @return void
   */
  public function rewind($row = 0)
  {
    if ($this->seek($row)) {
      $this->current_row = $row;
    }
  }

  /**
   * Moves the internal pointer to the specified row position.
   *
   * @param int $row <p>Row position; zero-based and set to 0 by default</p>
   *
   * @return bool <p>true on success, false otherwise</p>
   */
  public function seek($row = 0): bool
  {
    if (\is_int($row) && $row >= 0 && $row < $this->num_rows) {

      if ($this->doctrineMySQLiStmt) {
        $this->doctrineMySQLiStmt->data_seek($row);

        return true;
      }

      if ($this->doctrinePdoStmt) {
        return (bool)$this->doctrinePdoStmt->fetch(\PDO::FETCH_ASSOC, \PDO::FETCH_ORI_NEXT, $row);
      }

      return \mysqli_data_seek($this->_result, $row);
    }

    return false;
  }

  /**
   * Iterator interface implementation.
   *
   * @return bool <p>true if the current index is valid, false otherwise</p>
   */
  public function valid(): bool
  {
    return $this->current_row < $this->num_rows;
  }

  /**
   * Fetch.
   *
   * <p>
   *   <br />
   *   INFO: this will return an object by default, not an array<br />
   *   and you can change the behaviour via "Result->setDefaultResultType()"
   * </p>
   *
   * @param bool $reset optional <p>Reset the \mysqli_result counter.</p>
   *
   * @return array|object|false <p><strong>false</strong> on error</p>
   */
  public function fetch(bool $reset = false)
  {
    $return = false;

    if ($this->_default_result_type === self::RESULT_TYPE_OBJECT) {
      $return = $this->fetchObject('', null, $reset);
    } elseif ($this->_default_result_type === self::RESULT_TYPE_ARRAY) {
      $return = $this->fetchArray($reset);
    } elseif ($this->_default_result_type === self::RESULT_TYPE_ARRAYY) {
      $return = $this->fetchArrayy($reset);
    } elseif ($this->_default_result_type === self::RESULT_TYPE_YIELD) {
      $return = $this->fetchYield($reset);
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
    }

    return $return;
  }

  /**
   * Fetch all results.
   *
   * <p>
   *   <br />
   *   INFO: this will return an object by default, not an array<br />
   *   and you can change the behaviour via "Result->setDefaultResultType()"
   * </p>
   *
   * @return array
   */
  public function fetchAll(): array
  {
    $return = [];

    if ($this->_default_result_type === self::RESULT_TYPE_OBJECT) {
      $return = $this->fetchAllObject();
    } elseif ($this->_default_result_type === self::RESULT_TYPE_ARRAY) {
      $return = $this->fetchAllArray();
    } elseif ($this->_default_result_type === self::RESULT_TYPE_ARRAYY) {
      $return = $this->fetchAllArrayy();
    } elseif ($this->_default_result_type === self::RESULT_TYPE_YIELD) {
      $return = $this->fetchAllYield();
    }

    return $return;
  }

  /**
   * Fetch all results as array.
   *
   * @return array
   */
  public function fetchAllArray(): array
  {
    if ($this->is_empty()) {
      return [];
    }

    $this->reset();

    $data = [];
    /** @noinspection PhpAssignmentInConditionInspection */
    while ($row = $this->fetch_assoc()) {
      $data[] = $this->cast($row);
    }

    return $data;
  }

  /**
   * Fetch all results as "Arrayy"-object.
   *
   * @return Arrayy
   */
  public function fetchAllArrayy(): Arrayy
  {
    if ($this->is_empty()) {
      return Arrayy::create([]);
    }

    $this->reset();

    $data = [];
    /** @noinspection PhpAssignmentInConditionInspection */
    while ($row = $this->fetch_assoc()) {
      $data[] = $this->cast($row);
    }

    return Arrayy::create($data);
  }

  /**
   * Fetch a single column as an 1-dimension array.
   *
   * @param string $column
   * @param bool   $skipNullValues <p>Skip "NULL"-values. | default: false</p>
   *
   * @return array <p>Return an empty array if the "$column" wasn't found</p>
   */
  public function fetchAllColumn(string $column, bool $skipNullValues = false): array
  {
    return $this->fetchColumn($column, $skipNullValues, true);
  }

  /**
   * Fetch all results as array with objects.
   *
   * @param object|string $class  <p>
   *                              <strong>string</strong>: create a new object (with optional constructor
   *                              parameter)<br>
   *                              <strong>object</strong>: use a object and fill the the data into
   *                              </p>
   * @param null|array    $params optional
   *                              <p>
   *                              An array of parameters to pass to the constructor, used if $class is a
   *                              string.
   *                              </p>
   *
   * @return array
   */
  public function fetchAllObject($class = '', array $params = null): array
  {
    if ($this->is_empty()) {
      return [];
    }

    // fallback
    if (!$class || $class === 'stdClass') {
      $class = '\stdClass';
    }

    // init
    $data = [];
    $this->reset();
    $propertyAccessor = PropertyAccess::createPropertyAccessor();

    if (\is_object($class)) {

      $classTmpOrig = new $class;

    } elseif ($class && $params) {

      $reflectorTmp = new \ReflectionClass($class);
      $classTmpOrig = $reflectorTmp->newInstanceArgs($params);

    } else {

      $classTmpOrig = new $class;

    }

    /** @noinspection PhpAssignmentInConditionInspection */
    while ($row = $this->fetch_assoc()) {
      $classTmp = clone $classTmpOrig;
      $row = $this->cast($row);
      foreach ($row as $key => $value) {
$collection = json_decode($data, true);
if ( ! is_array($collection)) {
    throw new \RuntimeException('$collection must be an array.');
}

foreach ($collection as $item) { /** ... */ }
        if ($class === '\stdClass') {
          $classTmp->{$key} = $value;
        } else {
          $propertyAccessor->setValue($classTmp, $key, $value);
        }
      }
      $data[] = $classTmp;
    }

    return $data;
  }

  /**
   * Fetch all results as "\Generator" via yield.
   *
   * @param object|string $class  <p>
   *                              <strong>string</strong>: create a new object (with optional constructor
   *                              parameter)<br>
   *                              <strong>object</strong>: use a object and fill the the data into
   *                              </p>
   * @param null|array    $params optional
   *                              <p>
   *                              An array of parameters to pass to the constructor, used if $class is a
   *                              string.
   *                              </p>
   *
   * @return \Generator
   */
  public function fetchAllYield($class = '', array $params = null): \Generator
  {
    if ($this->is_empty()) {
      return;
    }

    // init
    $this->reset();

    // fallback
    if (!$class || $class === 'stdClass') {
      $class = '\stdClass';
    }

    $propertyAccessor = PropertyAccess::createPropertyAccessor();

    if (\is_object($class)) {

      $classTmpOrig = $class;

    } else if ($class && $params) {

      $reflectorTmp = new \ReflectionClass($class);
      $classTmpOrig = $reflectorTmp->newInstanceArgs($params);

    } else {

      $classTmpOrig = new $class;

    }

    /** @noinspection PhpAssignmentInConditionInspection */
    while ($row = $this->fetch_assoc()) {
      $classTmp = clone $classTmpOrig;
      $row = $this->cast($row);
      foreach ($row as $key => $value) {
$collection = json_decode($data, true);
if ( ! is_array($collection)) {
    throw new \RuntimeException('$collection must be an array.');
}

foreach ($collection as $item) { /** ... */ }
        if ($class === '\stdClass') {
          $classTmp->{$key} = $value;
        } else {
          $propertyAccessor->setValue($classTmp, $key, $value);
        }
      }
      yield $classTmp;
    }
  }

  /**
   * Fetch as array.
   *
   * @param bool $reset
   *
   * @return array|false <p><strong>false</strong> on error</p>
   */
  public function fetchArray(bool $reset = false)

  {
    if ($reset === true) {
      $this->reset();
    }

    $row = $this->fetch_assoc();
    if ($row) {
      return $this->cast($row);
    }

    if ($row === null || $row === false) {
      return [];
    }

    return false;
  }

  /**
   * Fetch data as a key/value pair array.
   *
   * <p>
   *   <br />
   *   INFO: both "key" and "value" must exists in the fetched data
   *   the key will be the new key of the result-array
   *   <br /><br />
   * </p>
   *
   * e.g.:
   * <code>
   *    fetchArrayPair('some_id', 'some_value');
   *    // array(127 => 'some value', 128 => 'some other value')
   * </code>
   *
   * @param string $key
   * @param string $value
   *
   * @return array
   */
  public function fetchArrayPair(string $key, string $value): array
  {
    $arrayPair = [];
    $data = $this->fetchAllArray();

    foreach ($data as &$_row) {
      if (
          \array_key_exists($key, $_row) === true
          &&
          \array_key_exists($value, $_row) === true
      ) {
        $_key = $_row[$key];
        $_value = $_row[$value];
        $arrayPair[$_key] = $_value;
      }
    }

    return $arrayPair;
  }

  /**
   * Fetch as "Arrayy"-object.
   *
   * @param bool $reset optional <p>Reset the \mysqli_result counter.</p>
   *
   * @return Arrayy|false <p><strong>false</strong> on error</p>
   */
  public function fetchArrayy(bool $reset = false)

  {
    if ($reset === true) {
      $this->reset();
    }

    $row = $this->fetch_assoc();
    if ($row) {
      return Arrayy::create($this->cast($row));

    }

    if ($row === null || $row === false) {
      return Arrayy::create();
    }

    return false;
  }

  /**
   * Fetches a row or a single column within a row. Returns null if there are
   * no more rows in the result.
   *
   * @param int    $row    The row number (optional)
   * @param string $column The column name (optional)
   *
   * @return mixed An associative array or a scalar value
   */
  public function fetchCallable(int $row = null, string $column = null)
  {
    if (!$this->num_rows) {
      return null;
    }

    if (null !== $row) {
      $this->seek($row);
    }

    $rows = $this->fetch_assoc();

    if ($column) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
      return \is_array($rows) && isset($rows[$column]) ? $rows[$column] : null;
    }

    return \is_callable($this->_mapper) ? \call_user_func($this->_mapper, $rows) : $rows;
  }

  /**
   * Fetch a single column as string (or as 1-dimension array).
   *
   * @param string $column
   * @param bool   $skipNullValues <p>Skip "NULL"-values. | default: true</p>
   * @param bool   $asArray        <p>Get all values and not only the last one. | default: false</p>
   *
   * @return string|array <p>Return a empty string or an empty array if the "$column" wasn't found, depend on
   *                      "$asArray"</p>
   */
  public function fetchColumn(string $column = '', bool $skipNullValues = true, bool $asArray = false)
  {
    if ($asArray === false) {
      $columnData = '';

      $data = $this->fetchAllArrayy()->reverse();
      foreach ($data as $_row) {

        if ($skipNullValues === true) {
          if (isset($_row[$column]) === false) {
            continue;
          }
        } else {
          if (\array_key_exists($column, $_row) === false) {
            break;
          }
        }

        $columnData = $_row[$column];
        break;
      }

      return $columnData;
    }

    // -- return as array -->

    $columnData = [];

    $data = $this->fetchAllArray();

    foreach ($data as $_row) {

      if ($skipNullValues === true) {
        if (isset($_row[$column]) === false) {
          continue;
        }
      } else {
        if (\array_key_exists($column, $_row) === false) {
          break;
        }
      }

      $columnData[] = $_row[$column];
    }

    return $columnData;
  }

  /**
   * Return rows of field information in a result set.
   *
   * @param bool $as_array Return each field info as array; defaults to false
   *
   * @return array Array of field information each as an associative array
   */
  public function fetchFields(bool $as_array = false): array
  {
    if ($as_array) {
      return \array_map(
          function ($object) {
            return (array)$object;
          },
          $this->fetch_fields()
      );
    }

    return $this->fetch_fields();
  }

  /**
   * Returns all rows at once as a grouped array of scalar values or arrays.
   *
   * @param string $group  The column name to use for grouping
   * @param string $column The column name to use as values (optional)
   *
   * @return array A grouped array of scalar values or arrays
   */
  public function fetchGroups(string $group, string $column = null): array

  {
    // init
    $groups = [];
    $pos = $this->current_row;

    foreach ($this as $row) {

      if (!\array_key_exists($group, $row)) {
        continue;
      }

      if (null !== $column) {

        if (!\array_key_exists($column, $row)) {
          continue;
        }

        $groups[$row[$group]][] = $row[$column];
      } else {
        $groups[$row[$group]][] = $row;
      }
    }

    $this->rewind($pos);

    return $groups;
  }

  /**
   * Fetch as object.
   *
   * @param object|string $class  <p>
   *                              <strong>string</strong>: create a new object (with optional constructor
   *                              parameter)<br>
   *                              <strong>object</strong>: use a object and fill the the data into
   *                              </p>
   * @param null|array    $params optional
   *                              <p>
   *                              An array of parameters to pass to the constructor, used if $class is a
   *                              string.
   *                              </p>
   * @param bool          $reset  optional <p>Reset the \mysqli_result counter.</p>
   *
   * @return object|false <p><strong>false</strong> on error</p>
   */
  public function fetchObject($class = '', array $params = null, bool $reset = false)

  {
    if ($reset === true) {
      $this->reset();
    }

    // fallback
    if (!$class || $class === 'stdClass') {
      $class = '\stdClass';
    }

    $row = $this->fetch_assoc();
    $row = $row ? $this->cast($row) : false;

    if (!$row) {
      return false;
    }

    $propertyAccessor = PropertyAccess::createPropertyAccessor();

    if (\is_object($class)) {

      $classTmp = $class;

    } elseif ($class && $params) {

      $reflectorTmp = new \ReflectionClass($class);
      $classTmp = $reflectorTmp->newInstanceArgs($params);

    } else {

      $classTmp = new $class;

    }

    foreach ($row as $key => $value) {
      if ($class === '\stdClass') {
        $classTmp->{$key} = $value;
      } else {
        $propertyAccessor->setValue($classTmp, $key, $value);
      }
    }

    return $classTmp;
  }

  /**
   * Returns all rows at once as key-value pairs.
   *
   * @param string $key    The column name to use as keys
   * @param string $column The column name to use as values (optional)
   *
   * @return array An array of key-value pairs
   */
  public function fetchPairs(string $key, string $column = null): array

  {
    // init
    $pairs = [];
    $pos = $this->current_row;

    foreach ($this as $row) {

      if (!\array_key_exists($key, $row)) {
        continue;
      }

      if (null !== $column) {

        if (!\array_key_exists($column, $row)) {
          continue;
        }

        $pairs[$row[$key]] = $row[$column];
      } else {
        $pairs[$row[$key]] = $row;
      }
    }

    $this->rewind($pos);

    return $pairs;
  }

  /**
   * Returns all rows at once, transposed as an array of arrays. Instead of
   * returning rows of columns, this method returns columns of rows.
   *
   * @param string $column The column name to use as keys (optional)
   *
   * @return mixed A transposed array of arrays
   */
  public function fetchTranspose(string $column = null)
  {
    // init
    $keys = null !== $column ? $this->fetchAllColumn($column) : [];
    $rows = [];
    $pos = $this->current_row;

    foreach ($this as $row) {
      foreach ($row as $key => $value) {
        $rows[$key][] = $value;
      }
    }

    $this->rewind($pos);

    if (empty($keys)) {
      return $rows;
    }

    return \array_map(
        function ($values) use ($keys) {
          return \array_combine($keys, $values);
        }, $rows
    );
  }

  /**
   * Fetch as "\Generator" via yield.
   *
   * @param object|string $class  <p>
   *                              <strong>string</strong>: create a new object (with optional constructor
   *                              parameter)<br>
   *                              <strong>object</strong>: use a object and fill the the data into
   *                              </p>
   * @param null|array    $params optional
   *                              <p>
   *                              An array of parameters to pass to the constructor, used if $class is a
   *                              string.
   *                              </p>
   * @param bool          $reset  optional <p>Reset the \mysqli_result counter.</p>
   *
   * @return \Generator
   */
  public function fetchYield($class = '', array $params = null, bool $reset = false): \Generator

  {
    if ($reset === true) {
      $this->reset();
    }

    // fallback
    if (!$class || $class === 'stdClass') {
      $class = '\stdClass';
    }

    $propertyAccessor = PropertyAccess::createPropertyAccessor();

    if (\is_object($class)) {

      $classTmp = $class;

    } elseif ($class && $params) {

      $reflectorTmp = new \ReflectionClass($class);
      $classTmp = $reflectorTmp->newInstanceArgs($params);

    } else {

      $classTmp = new $class;

    }

    $row = $this->fetch_assoc();
    $row = $row ? $this->cast($row) : false;

    if (!$row) {
      return;
    }

    foreach ($row as $key => $value) {
      if ($class === '\stdClass') {
        $classTmp->{$key} = $value;
      } else {
        $propertyAccessor->setValue($classTmp, $key, $value);
      }
    }

    yield $classTmp;
  }

  /**
   * @return mixed
   */
  private function fetch_assoc()
  {
    if ($this->_result instanceof \Doctrine\DBAL\Statement) {
      $this->_result->setFetchMode(\PDO::FETCH_ASSOC);
      $object = $this->_result->fetch();

      return $object;
    }

    return mysqli_fetch_assoc($this->_result);
  }

  /**
   * @return array|bool
   */
  private function fetch_fields()
  {
    if ($this->_result instanceof \mysqli_result) {
      return \mysqli_fetch_fields($this->_result);
    }

    if ($this->doctrineMySQLiStmt) {
      $metadataTmp = $this->doctrineMySQLiStmt->result_metadata();

      return $metadataTmp->fetch_fields();
    }

    if ($this->doctrinePdoStmt) {
      $fields = [];

      static $THIS_CLASS_TMP = null;
      if ($THIS_CLASS_TMP === null) {
        $THIS_CLASS_TMP = new \ReflectionClass(__CLASS__);
      }

      $totalColumnsTmp = $this->doctrinePdoStmt->columnCount();
      for ($counterTmp = 0; $counterTmp < $totalColumnsTmp; $counterTmp++) {
        $metadataTmp = $this->doctrinePdoStmt->getColumnMeta($counterTmp);
        $fieldTmp = new \stdClass();
        foreach ($metadataTmp as $metadataTmpKey => $metadataTmpValue) {
          $fieldTmp->{$metadataTmpKey} = $metadataTmpValue;
        }

        $typeNativeTmp = 'MYSQL_TYPE_' . $metadataTmp['native_type'];
        $typeTmp = $THIS_CLASS_TMP->getConstant($typeNativeTmp);
        if ($typeTmp) {
          $fieldTmp->type = $typeTmp;
        } else {
          $fieldTmp->type = '';
        }

        $fields[] = $fieldTmp;
      }

      return $fields;
    }

    return false;
  }

  /**
   * Returns the first row element from the result.
   *
   * @param string $column The column name to use as value (optional)
   *
   * @return mixed A row array or a single scalar value
   */
  public function first(string $column = null)
  {
    $pos = $this->current_row;
    $first = $this->fetchCallable(0, $column);
    $this->rewind($pos);

    return $first;
  }

  /**
   * free the memory
   */
  public function free()
  {
    if ($this->_result instanceof \mysqli_result) {
      /** @noinspection PhpUsageOfSilenceOperatorInspection */
      @\mysqli_free_result($this->_result);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
      $this->_result = null;

      return true;
    }

    $this->_result = null;

    return false;
  }

  /**
   * alias for "Result->fetch()"
   *
   * @see Result::fetch()
   *
   * @return array|object|false <p><strong>false</strong> on error</p>
   */
  public function get()
  {
    return $this->fetch();
  }

  /**
   * alias for "Result->fetchAll()"
   *
   * @see Result::fetchAll()
   *
   * @return array
   */
  public function getAll(): array
  {
    return $this->fetchAll();
  }

  /**
   * alias for "Result->fetchAllColumn()"
   *
   * @see Result::fetchAllColumn()
   *
   * @param string $column
   * @param bool   $skipNullValues
   *
   * @return array
   */
  public function getAllColumn(string $column, bool $skipNullValues = false): array
  {
    return $this->fetchAllColumn($column, $skipNullValues);
  }

  /**
   * alias for "Result->fetchAllArray()"
   *
   * @see Result::fetchAllArray()
   *
   * @return array
   */
  public function getArray(): array
  {
    return $this->fetchAllArray();
  }

  /**
   * alias for "Result->fetchAllArrayy()"
   *
   * @see Result::fetchAllArrayy()
   *
   * @return Arrayy
   */
  public function getArrayy(): Arrayy
  {
    return $this->fetchAllArrayy();
  }

  /**
   * alias for "Result->fetchColumn()"
   *
   * @see Result::fetchColumn()
   *
   * @param string $column
   * @param bool   $asArray
   * @param bool   $skipNullValues
   *
   * @return string|array <p>Return a empty string or an empty array if the "$column" wasn't found, depend on
   *                      "$asArray"</p>
   */
  public function getColumn(string $column, bool $skipNullValues = true, bool $asArray = false)
  {
    return $this->fetchColumn($column, $skipNullValues, $asArray);
  }

  /**
   * @return string
   */
  public function getDefaultResultType(): string
  {
    return $this->_default_result_type;
  }

  /**
   * alias for "Result->fetchAllObject()"
   *
   * @see Result::fetchAllObject()
   *
   * @return array of mysql-objects
   */
  public function getObject(): array
  {
    return $this->fetchAllObject();
  }

  /**
   * alias for "Result->fetchAllYield()"
   *
   * @see Result::fetchAllYield()
   *
   * @param bool $asArray
   *
   * @return \Generator
   */
  public function getYield($asArray = false): \Generator
  {
    yield $this->fetchAllYield($asArray);
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
  }

  /**
   * Check if the result is empty.
   *
   * @return bool
   */
  public function is_empty(): bool
  {
    return !($this->num_rows > 0);
  }

  /**
   * Fetch all results as "json"-string.
   *
   * @return string
   */
  public function json(): string
  {
    $data = $this->fetchAllArray();

    return UTF8::json_encode($data);
  }

  /**
   * Returns the last row element from the result.
   *
   * @param string $column The column name to use as value (optional)
   *
   * @return mixed A row array or a single scalar value
   */
  public function last(string $column = null)
  {
    $pos = $this->current_row;
    $last = $this->fetchCallable($this->num_rows - 1, $column);
    $this->rewind($pos);

    return $last;
  }

  /**
   * Set the mapper...
   *
   * @param \Closure $callable
   *
   * @return $this
   */
  public function map(\Closure $callable): self
  {
    $this->_mapper = $callable;

    return $this;
  }

  /**
   * Alias of count(). Deprecated.
   *
   * @return int The number of rows in the result
   */
  public function num_rows(): int
  {
    return $this->count();
  }

  /**
   * ArrayAccess interface implementation.
   *
   * @param int $offset <p>Offset number</p>
   *
   * @return bool <p>true if offset exists, false otherwise</p>
   */
  public function offsetExists($offset): bool
  {
    return \is_int($offset) && $offset >= 0 && $offset < $this->num_rows;
  }

  /**
   * ArrayAccess interface implementation.
   *
   * @param int $offset Offset number
   *
   * @return mixed
   */
  public function offsetGet($offset)
  {
    if ($this->offsetExists($offset)) {
      return $this->fetchCallable($offset);
    }

    throw new \OutOfBoundsException("undefined offset ($offset)");
  }

  /**
   * ArrayAccess interface implementation. Not implemented by design.
   *
   * @param mixed $offset
   * @param mixed $value
   */
  public function offsetSet($offset, $value)
  {
    /** @noinspection UselessReturnInspection */
    return;
  }

  /**
   * ArrayAccess interface implementation. Not implemented by design.
   *
   * @param mixed $offset
   */
  public function offsetUnset($offset)
  {
    /** @noinspection UselessReturnInspection */
    return;
  }

  /**
   * Reset the offset (data_seek) for the results.
   *
   * @return Result
   */
  public function reset(): self
  {
    if (!$this->is_empty()) {

      if ($this->doctrineMySQLiStmt) {
        $this->doctrineMySQLiStmt->data_seek(0);
      }

      if ($this->_result instanceof \mysqli_result) {
        \mysqli_data_seek($this->_result, 0);
      }
    }

    return $this;
  }

  /**
   * You can set the default result-type to Result::RESULT_TYPE_*.
   *
   * INFO: used for "fetch()" and "fetchAll()"
   *
   * @param string $default_result_type
   */
  public function setDefaultResultType(string $default_result_type = self::RESULT_TYPE_OBJECT)
  {
    if (
        $default_result_type === self::RESULT_TYPE_OBJECT
        ||
        $default_result_type === self::RESULT_TYPE_ARRAY
        ||
        $default_result_type === self::RESULT_TYPE_ARRAYY
        ||
        $default_result_type === self::RESULT_TYPE_YIELD
    ) {
      $this->_default_result_type = $default_result_type;
    }
  }

  /**
   * @param int      $offset
   * @param null|int $length
   * @param bool     $preserve_keys
   *
   * @return array
   */
  public function slice(int $offset = 0, int $length = null, bool $preserve_keys = false): array
  {
    // init
    $slice = [];

    if ($offset < 0) {
      if (\abs($offset) > $this->num_rows) {
        $offset = 0;
      } else {
        $offset = $this->num_rows - (int)\abs($offset);
      }
    }

    $length = null !== $length ? (int)$length : $this->num_rows;
    $n = 0;
    for ($i = $offset; $i < $this->num_rows && $n < $length; $i++) {
      if ($preserve_keys) {
        $slice[$i] = $this->fetchCallable($i);
      } else {
        $slice[] = $this->fetchCallable($i);
      }
      ++$n;
    }

    return $slice;
  }
}

voku / simple-mysqli

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