Get warnings from last operation

# RowResult::getWarnings

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RowResult::getWarnings — Get warnings from last operation

### Description

public mysql_xdevapi\RowResult::getWarnings(): array

Retrieve warnings from the last RowResult operation.

### Parameters

This function has no parameters.

### Return Values

An array of Warning objects from the last operation. Each object defines an error 'message', error 'level', and error 'code'. An empty array is returned if no errors are present.

### Examples

Example #1 mysql_xdevapi\RowResult::getWarnings() example

`<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$session->sql("CREATE DATABASE foo")->execute();
$session->sql("CREATE TABLE foo.test_table(x int)")->execute();
$schema = $session->getSchema("foo");
$table = $schema->getTable("test_table");
$table->insert(['x'])->values([1])->values([2])->execute();
$res = $table->select(['x/0 as bad_x'])->execute();
$warnings = $res->getWarnings();
print_r($warnings);
?>`

The above example will output something similar to:

    Array
    (
        [0] => mysql_xdevapi\Warning Object
            (
                [message] => Division by 0
                [level] => 2
                [code] => 1365
            )
        [1] => mysql_xdevapi\Warning Object
            (
                [message] => Division by 0
                [level] => 2
                [code] => 1365
            )
    )

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