Get a list of instances on ec2 without termination protection

The AWS CLI now supports the --query parameter which takes a JMESPath expressions.

This means you can sum the size values given by list-objects using sum(Contents[].Size) and count like length(Contents[]).

This can be be run using the official AWS CLI as below and was introduced in Feb 2014

 aws s3api list-objects --bucket BUCKETNAME --output json --query "[sum(Contents[].Size), length(Contents[])]"

I think you would use the AWS php sdk;
http://aws.amazon.com/sdkforphp/

Run through the getting started guide to setup your keys;
http://aws.amazon.com/articles/4261?_encoding=UTF8&jiveRedirect=1

And then use the describe_instances function to collect an array of instances;
http://docs.amazonwebservices.com/AWSSDKforPHP/latest/#m=AmazonEC2/describe_instances

It looks like you could either construct and filter to return only running instances, or then loop over the returned like to to get more detailed information using the describe_instance_status function;
http://docs.amazonwebservices.com/AWSSDKforPHP/latest/#m=AmazonEC2/describe_instance_status

Something tlike the following will work...

<?php
require_once "/home/XXX/src/php-aws-sdk-1.5.3/sdk.class.php";
CFCredentials::set(array(
    'testing' => array(
        'key' => 'XXX',
        'secret' => '+YYY+',
        'default_cache_config' => '',
        'certificate_authority' => false
    ),
    // Specify a default credential set to use if there are more than one.
    '@default' => 'testing'
));
$ec2 = new AmazonEC2();
$response = $ec2->describe_instances(array( "Filter" => array(
  array("Name"=>"instance-state-code", "Value" => "16"))));
foreach($response as $res){
 var_dump( $res );
}
?>

instance state code 16 is for "running"