# mysqli_result::field_seek

# mysqli_field_seek

(PHP 5, PHP 7, PHP 8)

mysqli_result::field_seek -- mysqli_field_seek — Set result pointer to a specified field offset

### 说明

面向对象风格

public mysqli_result::field_seek(int `$index`): true

过程化风格

mysqli_field_seek(mysqli_result `$result`, int `$index`): true

Sets the field cursor to the given offset. The next call to mysqli_fetch_field() will retrieve the field definition of the column associated with that offset.

> 注意:

> To seek to the beginning of a row, pass an offset value of zero.

### 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。

`index`

  The field number. This value must be in the range from `0` to `number of fields - 1`.

### 返回值

总是返回 `true`。

### 更新日志

版本 | 说明
--- | ---
8.0.0 | This function now always returns `true`. Previously it returned `false` on failure.

### 示例

示例 #1 面向对象风格

`<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";
if ($result = $mysqli->query($query)) {
/* Get field information for 2nd column */
$result->field_seek(1);
$finfo = $result->fetch_field();
printf("Name: %s\n", $finfo->name);
printf("Table: %s\n", $finfo->table);
printf("max. Len: %d\n", $finfo->max_length);
printf("Flags: %d\n", $finfo->flags);
printf("Type: %d\n\n", $finfo->type);
$result->close();
}
/* close connection */
$mysqli->close();
?>`

示例 #2 过程化风格

`<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";
if ($result = mysqli_query($link, $query)) {
/* Get field information for 2nd column */
mysqli_field_seek($result, 1);
$finfo = mysqli_fetch_field($result);
printf("Name: %s\n", $finfo->name);
printf("Table: %s\n", $finfo->table);
printf("max. Len: %d\n", $finfo->max_length);
printf("Flags: %d\n", $finfo->flags);
printf("Type: %d\n\n", $finfo->type);
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>`

以上示例会输出：

    Name:     SurfaceArea
    Table:    Country
    max. Len: 10
    Flags:    32769
    Type:     4

### 参见

- mysqli_fetch_field() - Returns the next field in the result set

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