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
说明
面向对象风格
过程化风格
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。
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.
There is no way to return another column from the same row if you use this function to retrieve data.
示例
示例 #1 mysqli_result::fetch_column() 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 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);
}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 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);
}以上示例的输出类似于：
Rafah Nablus Jabaliya Hebron Khan Yunis
参见
- mysqli_fetch_all() - Fetch all result rows as an associative array, a numeric array, or both
- 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_object() - Fetch the next row of a result set as an object
- mysqli_fetch_row() - Fetch the next row of a result set as an enumerated array
- mysqli_data_seek() - Adjusts the result pointer to an arbitrary row in the result
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