a quickly hacked together script to generate a .ssh/config from aws instances

aws-generate-ssh-config.php

<?php
$ssh_instances = [];
$ssh_user = 'root';

require 'vendor/autoload.php';

$ec2 = new Aws\Ec2\Ec2Client([
    'version' => 'latest',
    'region'  => 'us-east-1'
]);

$describe_instances = $ec2->DescribeInstances();

foreach ($describe_instances['Reservations'] as $reservation) {
  foreach ($reservation['Instances'] as $instance) {
    if (isset($instance['PublicIpAddress'])) {
      $public_ip = $instance['PublicIpAddress'];
    }
    foreach ($instance['Tags'] as $tag) {
      if ($tag['Key'] == 'Name') {
        //Strip any white spaces/comments that may be in the name.
        $name = strtok($tag['Value'],' ');
        $instance_name = $name;
      }
    }
    if (isset($instance_name) && isset($public_ip)) {
      $ssh_instances[] = [
        'instance_name' => $instance_name,
        'public_ip' => $public_ip,
      ];
    }
    if (isset($public_ip)) unset($public_ip);
    if (isset($instance_name)) unset($instance_name);
  }
}

/*
Host example
  HostName 54.100.100.100
  User ubuntu
  IdentityFile ~/.ssh/example.aws.pem
*/

$ssh_config = '';

foreach ($ssh_instances as $ssh_instance) {
  $instance_name = $ssh_instance['instance_name'];
  $public_ip = $ssh_instance['public_ip'];

  $ssh_config .= "Host $instance_name\n";
  $ssh_config .= "  HostName $public_ip\n";
  $ssh_config .= "  User $ssh_user\n";
  $ssh_config .= "\n";
}

print_r($ssh_config);

again, hacked this up really quick at work.

could be improved greatly and would like to do so in the future.