Returns the number of parameters for the given statement

# mysqli_stmt::$param_count

# mysqli_stmt_param_count

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::$param_count -- mysqli_stmt_param_count — Returns the number of parameters for the given statement

### 说明

面向对象风格

int $mysqli_stmt->param_count;

过程化风格

function mysqli_stmt_param_count(mysqli_stmt `$statement`): int

Returns the number of parameter markers present in the prepared statement.

### 参数

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

### 返回值

Returns an integer representing the number of parameters.

### 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();
    }

    if ($stmt = $mysqli->prepare("SELECT Name FROM Country WHERE Name=? OR Code=?")) {

        $marker = $stmt->param_count;
        printf("Statement has %d markers.\n", $marker);

        /* close statement */
        $stmt->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();
    }

    if ($stmt = mysqli_prepare($link, "SELECT Name FROM Country WHERE Name=? OR Code=?")) {

        $marker = mysqli_stmt_param_count($stmt);
        printf("Statement has %d markers.\n", $marker);

        /* close statement */
        mysqli_stmt_close($stmt);
    }

    /* close connection */
    mysqli_close($link);
    ?>

以上示例会输出：

    Statement has 2 markers.

### 参见

- mysqli_prepare() - 预处理执行 SQL

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