Php - 亚马逊s3如何检查我的连接是否成功

I am using amazon-php-sdk. In my application I'm accepting key and secret value from a form and passing for connecting to Aws. Here is my code.

<?php
require 'aws-autoloader.php';
use Aws\S3\S3Client;
try {
    $s3Client = S3Client::factory(array(
        'key' => 'my key',
        'secret' => 'my secret key'
    ));
}
catch(S3Exception $e) {

   echo 'Msg' . $e->getMessage();
} 
?>

1. How do I check whether the connection is success or not ?
2. How can I check the already created object using the passed key so I that I don't want to create the object again. I need to create the object only if the passed key is different from the already created one.

As Michael pointed out, you have to make an actual request to check the connection.AWS discourages any unnecessary validation requests which will affect the performance of your application and your usage bill.

But if you need to validate you can use ListBucket or HEAD request on a bucket.

Checkout this best practises article.

require 'vendor/autoload.php';     
use Aws\S3\S3Client;

try {

// Instantiate the S3 client with your AWS credentials
$s3Client = S3Client::factory(array(
    'credentials' => array(
        'key'    => 'YOUR_AWS_ACCESS_KEY_ID',
        'secret' => 'YOUR_AWS_SECRET_ACCESS_KEY',
    )
));

$buckets = $s3Client->listBuckets();


}
catch(Exception $e) {

   exit($e->getMessage());
} 

To answer your second question.You can use doesObjectExist function which returns a boolean.