(PHP 5, PHP 7, PHP 8)
mysqli_result::$current_field -- mysqli_field_tell — 获取结果指针的当前字段偏移量
result仅过程式风格：由 mysqli_query()、mysqli_store_result()、mysqli_use_result() 或 mysqli_stmt_get_result() 返回的 mysqli_result 对象。
返回字段光标的当前偏移量。
示例 #1 面向对象风格
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* 检查连接 */
if (mysqli_connect_errno()) {
printf("连接失败: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";
if ($result = $mysqli->query($query)) {
/* 获取所有列的字段信息 */
while ($finfo = $result->fetch_field()) {
/* 获取字段指针偏移量 */
$currentfield = $result->current_field;
printf("列 %d:\n", $currentfield);
printf("名称: %s\n", $finfo->name);
printf("表: %s\n", $finfo->table);
printf("最大长度: %d\n", $finfo->max_length);
printf("标志: %d\n", $finfo->flags);
printf("类型: %d\n\n", $finfo->type);
}
$result->close();
}
/* 关闭连接 */
$mysqli->close();
?>示例 #2 过程式风格
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* 检查连接 */
if (mysqli_connect_errno()) {
printf("连接失败: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";
if ($result = mysqli_query($link, $query)) {
/* 获取所有字段的信息 */
while ($finfo = mysqli_fetch_field($result)) {
/* 获取字段指针偏移量 */
$currentfield = mysqli_field_tell($result);
printf("列 %d:\n", $currentfield);
printf("名称: %s\n", $finfo->name);
printf("表: %s\n", $finfo->table);
printf("最大长度: %d\n", $finfo->max_length);
printf("标志: %d\n", $finfo->flags);
printf("类型: %d\n\n", $finfo->type);
}
mysqli_free_result($result);
}
/* 关闭连接 */
mysqli_close($link);
?>以上示例将输出
Column 1: Name: Name Table: Country max. Len: 11 Flags: 1 Type: 254 Column 2: Name: SurfaceArea Table: Country max. Len: 10 Flags: 32769 Type: 4