Call to a member function sendEmail() on null - php

Question

I am using the AWS example to call the AWS SDK for PHP. When converting the code to a function I get the following error: Uncaught Error: Call to a member function sendEmail()
line 41 seems to be the issue: $result = $SesClient->sendEmail([
I have tried removing the result variable and commenting out its usage
When I run the code and its not a function its working fine, I am not sure what I am doing wrong here, and I am sure it could be a simple error.
Thanks for the help in advance
<?php
// If necessary, modify the path in the require statement below to refer to the
// location of your Composer autoload.php file.
require '/vendor/autoload.php';
use Aws\Ses\SesClient;
use Aws\Exception\AwsException;
// Create an SesClient. Change the value of the region parameter if you're
// using an AWS Region other than US West (Oregon). Change the value of the
// profile parameter if you want to use a profile in your credentials file
// other than the default.
$SesClient = new SesClient([
'profile' => 'default',
'version' => '2010-12-01',
'region' => 'us-east-1'
]);
function send_email($recipient, $message, $subject){
// Replace sender#example.com with your "From" address.
// This address must be verified with Amazon SES.
$sender_email = 'sender#gmail.com';
// Replace these sample addresses with the addresses of your recipients. If
// your account is still in the sandbox, these addresses must be verified.
// $recipient_emails = ['recipient1#example.com','recipient2#example.com'];
$recipient_emails = [$recipient];
// Specify a configuration set. If you do not want to use a configuration
// set, comment the following variable, and the
// 'ConfigurationSetName' => $configuration_set argument below.
// $configuration_set = 'ConfigSet';
$subject = $subject;
$plaintext_body = $message.PHP_EOL.'This email was sent with Amazon SES using the AWS SDK for PHP.' ;
$html_body = '<h1>'.$message.'</h1>';
$char_set = 'UTF-8';
try {
$result = $SesClient->sendEmail([
'Destination' => [
'ToAddresses' => $recipient_emails,
],
'ReplyToAddresses' => [$sender_email],
'Source' => $sender_email,
'Message' => [
'Body' => [
'Html' => [
'Charset' => $char_set,
'Data' => $html_body,
],
'Text' => [
'Charset' => $char_set,
'Data' => $plaintext_body,
],
],
'Subject' => [
'Charset' => $char_set,
'Data' => $subject,
],
],
// If you aren't using a configuration set, comment or delete the
// following line
// 'ConfigurationSetName' => $configuration_set,
]);
$messageId = $result['MessageId'];
echo("Email sent! Message ID: $messageId"."\n");
} catch (AwsException $e) {
// output error message if fails
echo $e->getMessage();
echo("The email was not sent. Error message: ".$e->getAwsErrorMessage()."\n");
echo "\n";
}
return 'success';
}
echo send_email('test#gmail.com', 'test', 'test subject');

Answer 1

Try declaring $SesClient inside of the send_email function

Answer 2

It's working without the function as you've declared $SesClient outside the function. Declare it after function - or pass it to the function via
function function send_email($recipient, $message, $subject, $SesClient) {
/* snip */
}
echo send_email('test#gmail.com', 'test', 'test subject', $SesClient);