Fetch extended error information associated with the last operation on the database handle

# PDO::errorInfo

(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0)

PDO::errorInfo — Fetch extended error information associated with the last operation on the database handle

### 说明

public function PDO::errorInfo(): array

### 参数

此函数没有参数。

### 返回值

PDO::errorInfo() returns an array of error information about the last operation performed by this database handle. The array consists of at least the following fields:

Element | Information
--- | ---
0 | SQLSTATE error code (a five characters alphanumeric identifier defined in the ANSI SQL standard).
1 | Driver-specific error code.
2 | Driver-specific error message.

> 注意:

> If the SQLSTATE error code is not set or there is no driver-specific error, the elements following element 0 will be set to `null`.

PDO::errorInfo() only retrieves error information for operations performed directly on the database handle. If you create a PDOStatement object through PDO::prepare() or PDO::query() and invoke an error on the statement handle, PDO::errorInfo() will not reflect the error from the statement handle. You must call PDOStatement::errorInfo() to return the error information for an operation performed on a particular statement handle.

### 示例

示例 #1 Displaying errorInfo() fields for a PDO_ODBC connection to a DB2 database

    <?php
    /* Provoke an error -- bogus SQL syntax */
    $stmt = $dbh->prepare('bogus sql');
    if (!$stmt) {
        echo "\nPDO::errorInfo():\n";
        print_r($dbh->errorInfo());
    }
    ?>

以上示例会输出：

    PDO::errorInfo():
    Array
    (
        [0] => HY000
        [1] => 1
        [2] => near "bogus": syntax error
    )

### 参见

- PDO::errorCode() - 获取跟数据库句柄上一次操作相关的 SQLSTATE
- PDOStatement::errorCode() - 获取跟上一次语句句柄操作相关的 SQLSTATE
- PDOStatement::errorInfo() - 获取跟上一次语句句柄操作相关的扩展错误信息

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