# mysqli_stmt::bind_result

# mysqli_stmt_bind_result

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::bind_result -- mysqli_stmt_bind_result — Binds variables to a prepared statement for result storage

### 说明

面向对象风格

public mysqli_stmt::bind_result(mixed `&$var`, mixed `&...$vars`): bool

过程化风格

mysqli_stmt_bind_result(mysqli_stmt `$statement`, mixed `&$var`, mixed `&...$vars`): bool

Binds columns in the result set to variables.

When mysqli_stmt_fetch() is called to fetch data, the MySQL client/server protocol places the data for the bound columns into the specified variables `var`/`vars`.

A column can be bound or rebound at any time, even after a result set has been partially retrieved. The new binding takes effect the next time mysqli_stmt_fetch() is called.

> 注意:

> All columns must be bound after mysqli_stmt_execute() and prior to calling mysqli_stmt_fetch().

> 注意:

> Depending on column types bound variables can silently change to the corresponding PHP type.

小技巧

This function is useful for simple results. To retrieve iterable result set, or fetch each row as an array or object, use mysqli_stmt_get_result().

### 参数

`statement`

  仅以过程化样式：由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。

`var`

  The first variable to be bound.

`vars`

  Further variables to be bound.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 示例

示例 #1 面向对象风格

`<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* prepare statement */
$stmt = $mysqli->prepare("SELECT Code, Name FROM Country ORDER BY Name LIMIT 5");
$stmt->execute();
/* bind variables to prepared statement */
$stmt->bind_result($col1, $col2);
/* fetch values */
while ($stmt->fetch()) {
printf("%s %s\n", $col1, $col2);
}`

示例 #2 过程化风格

`<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* prepare statement */
$stmt = mysqli_prepare($link, "SELECT Code, Name FROM Country ORDER BY Name LIMIT 5");
mysqli_stmt_execute($stmt);
/* bind variables to prepared statement */
mysqli_stmt_bind_result($stmt, $col1, $col2);
/* fetch values */
while (mysqli_stmt_fetch($stmt)) {
printf("%s %s\n", $col1, $col2);
}`

以上示例的输出类似于：

    AFG Afghanistan
    ALB Albania
    DZA Algeria
    ASM American Samoa
    AND Andorra

### 参见

- mysqli_stmt_get_result() - Gets a result set from a prepared statement as a mysqli_result object
- mysqli_stmt_bind_param() - Binds variables to a prepared statement as parameters
- mysqli_stmt_execute() - Executes a prepared statement
- mysqli_stmt_fetch() - Fetch results from a prepared statement into the bound variables
- mysqli_prepare() - 预处理执行 SQL
- mysqli_stmt_prepare() - Prepares an SQL statement for execution

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