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    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

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