mysqli_result::fetch_column

mysqli_fetch_column

(PHP 8 >= 8.1.0)

mysqli_result::fetch_column -- mysqli_fetch_column — Fetch a single column from the next row of a result set

說明

面向對象風格

public mysqli_result::fetch_column(int $column = 0): null|int|float|string|false

過程化風格

mysqli_fetch_column(mysqli_result $result, int $column = 0): null|int|float|string|false

Fetches one row of data from the result set and returns the 0-indexed column. Each subsequent call to this function will return the value from the next row within the result set, or false if there are no more rows.

注意: 此函數將 NULL 字段設置為 PHP null 值。

參數

result

僅以過程化樣式：由 mysqli_query()、mysqli_store_result()、 mysqli_use_result()、mysqli_stmt_get_result() 返回的 mysqli_result 對象。

column

0-indexed number of the column you wish to retrieve from the row. If no value is supplied, the first column will be returned.

返回值

Returns a single column from the next row of a result set or false if there are no more rows.

警告

There is no way to return another column from the same row if you use this function to retrieve data.

范例

示例 #1 mysqli_result::fetch_column() example

面向對象風格

<?php

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

$query = "SELECT CountryCode, Name FROM City ORDER BY ID DESC LIMIT 5";

$result = $mysqli->query($query);

/* fetch a single value from the second column */
while ($Name = $result->fetch_column(1)) {
    printf("%s\n", $Name);
}

過程化風格

<?php

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

$query = "SELECT CountryCode, Name FROM City ORDER BY ID DESC LIMIT 5";

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

/* fetch a single value from the second column */
while ($Name = mysqli_fetch_column($result, 1)) {
    printf("%s\n", $Name);
}

以上例程的輸出類似于：

Rafah
Nablus
Jabaliya
Hebron
Khan Yunis

參見