mysqli_result::$current_field
(PHP 5, PHP 7)
mysqli_result :: $ current_field - mysqli_field_tell - 获取结果指针的当前字段偏移量
描述
面向对象的风格
int $mysqli_result->current_field ;
程序风格
int mysqli_field_tell ( mysqli_result $result )返回用于最后一个mysqli_fetch_field（）调用的字段游标的位置。该值可以用作mysqli_field_seek（）的参数。
参数
`result` 仅过程风格：由mysqli_query（），mysqli_store_result（）或mysqli_use_result（）返回的结果集标识符。
返回值
返回字段光标的当前偏移量。
例子
Example＃1面向对象的风格
<?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?all?columns?*/
????while?($finfo?=?$result->fetch_field())?{
????????/*?get?fieldpointer?offset?*/
????????$currentfield?=?$result->current_field;
????????printf("Column?%d:\n",?$currentfield);
????????printf("Name:?????%s\n",?$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程序风格
<?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?all?fields?*/
????while?($finfo?=?mysqli_fetch_field($result))?{
????????/*?get?fieldpointer?offset?*/
????????$currentfield?=?mysqli_field_tell($result);
????????printf("Column?%d:\n",?$currentfield);
????????printf("Name:?????%s\n",?$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);
?>上面的例子会输出：
Column 1:
Name: Name
Table: Country
max. Len: 11
Flags: 1
Type: 254
Column 2:
Name: SurfaceArea
Table: Country
max. Len: 10
Flags: 32769
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