Fetch the next row of a result set as an associative array

# mysqli_result::fetch_assoc

# mysqli_fetch_assoc

(PHP 5, PHP 7, PHP 8)

mysqli_result::fetch_assoc -- mysqli_fetch_assoc — Fetch the next row of a result set as an associative array

### 说明

面向对象风格

public function mysqli_result::fetch_assoc(): array|null|false

过程化风格

function mysqli_fetch_assoc(mysqli_result `$result`): array|null|false

Fetches one row of data from the result set and returns it as an associative array. 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: 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。

### 返回值

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

### 示例

示例 #1 mysqli_result::fetch_assoc() 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);

    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
        printf("%s (%s)\n", $row["Name"], $row["CountryCode"]);
    }

过程化风格

    <?php

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

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

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

    /* fetch associative array */
    while ($row = mysqli_fetch_assoc($result)) {
        printf("%s (%s)\n", $row["Name"], $row["CountryCode"]);
    }

以上示例的输出类似于：

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

示例 #2 Comparison of mysqli_result iterator and mysqli_result::fetch_assoc() usage

mysqli_result can be iterated using `foreach`. The result set will always be iterated from the first row, regardless of the current position.

    <?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';

    // Using iterators
    $result = $mysqli->query($query);
    foreach ($result as $row) {
        printf("%s (%s)\n", $row["Name"], $row["CountryCode"]);
    }

    echo "\n==================\n";

    // Not using iterators
    $result = $mysqli->query($query);
    while ($row = $result->fetch_assoc()) {
        printf("%s (%s)\n", $row["Name"], $row["CountryCode"]);
    }

以上示例的输出类似于：

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

    ==================
    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_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_fetch_object() - Fetch the next row of a result set as an object
- 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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