Fetch the next row of a result set as an object

# mysqli_result::fetch_object

# mysqli_fetch_object

(PHP 5, PHP 7, PHP 8)

mysqli_result::fetch_object -- mysqli_fetch_object — Fetch the next row of a result set as an object

### 说明

面向对象风格

public function mysqli_result::fetch_object(string `$class` = "stdClass", array `$constructor_args` = []): object|null|false

过程化风格

function mysqli_fetch_object(mysqli_result `$result`, string `$class` = "stdClass", array `$constructor_args` = []): object|null|false

Fetches one row of data from the result set and returns it as an object, where each property represents the name of the result set's column. Each subsequent call to this function will return the next row within the result set, or `null` if there are no more rows.

If two or more columns of the result have the same name, the last column will take precedence and overwrite any previous data. To access multiple columns with the same name, mysqli_fetch_row() may be used to fetch the numerically indexed array, or aliases may be used in the SQL query select list to give columns different names.

> 注意: This function sets the properties of the object before calling the object constructor.

> 注意: 此函数返回的字段名大小写敏感。

> 注意: 此函数将 NULL 字段设置为 PHP `null` 值。

### 参数

`result`
  仅以过程化样式：由 mysqli_query()、mysqli_store_result()、 mysqli_use_result()、mysqli_stmt_get_result() 返回的 mysqli_result 对象。
`class`

  The name of the class to instantiate, set the properties of and return. If not specified, a stdClass object is returned.

`constructor_args`

  An optional array of parameters to pass to the constructor for `class` objects.

### 返回值

Returns an object representing the fetched row, where each property represents the name of the result set's column, `null` if there are no more rows in the result set, 或者在失败时返回 `false`.

### 错误／异常

A ValueError is thrown when the `constructor_args` is non-empty with the class not having constructor.

### 更新日志

版本 | 说明
--- | ---
8.3.0 | Now throws a ValueError exception when the `constructor_args` is non-empty with the class not having constructor; previously an Exception was thrown.
8.0.0 | `constructor_args` now accepts `[]` for constructors with 0 parameters; previously an exception was thrown.

### 示例

示例 #1 mysqli_result::fetch_object() example

面向对象风格

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

    $query = "SELECT Name, CountryCode FROM City ORDER BY ID DESC";

    $result = $mysqli->query($query);

    while ($obj = $result->fetch_object()) {
        printf("%s (%s)\n", $obj->Name, $obj->CountryCode);
    }

过程化风格

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $link = mysqli_connect("localhost", "my_user", "my_password", "world");

    $query = "SELECT Name, CountryCode FROM City ORDER BY ID DESC";

    $result = mysqli_query($link, $query);

    while ($obj = mysqli_fetch_object($result)) {
        printf("%s (%s)\n", $obj->Name, $obj->CountryCode);
    }

以上示例的输出类似于：

    Pueblo (USA)
    Arvada (USA)
    Cape Coral (USA)
    Green Bay (USA)
    Santa Clara (USA)

### 参见

- mysqli_fetch_array() - Fetch the next row of a result set as an associative, a numeric array, or both
- mysqli_fetch_assoc() - Fetch the next row of a result set as an associative array
- mysqli_fetch_column() - Fetch a single column from the next row of a result set
- mysqli_fetch_row() - Fetch the next row of a result set as an enumerated array
- mysqli_query() - 对数据库执行查询
- mysqli_data_seek() - Adjusts the result pointer to an arbitrary row in the result

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