(PHP 8 >= 8.1.0)
mysqli_result::fetch_column -- mysqli_fetch_column — Fetch a single column from the next row of a result set
面向對象風(fēng)格
$column = 0): null|int|float|string|false過(guò)程化風(fēng)格
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。
result僅以過(guò)程化樣式：由 mysqli_query()、mysqli_store_result()、 mysqli_use_result()、mysqli_stmt_get_result() 返回的 mysqli_result 對象。
column0-indexed number of the column you wish to retrieve from the row. If no value is supplied, the first column will be returned.
Returns a single column
from the next row of a result set or false if there are no more rows.
There is no way to return another column from the same row if you use this function to retrieve data.
示例 #1 mysqli_result::fetch_column() example
面向對象風(fēng)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(guò)程化風(fēng)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(lèi)似于：
Rafah Nablus Jabaliya Hebron Khan Yunis