If you want to restrict final results to one ore more criteria, the filter feature is what you are waiting for.

This feature was introduced in CompatInfo 4.2.0, following user request GH-197.

Your first filter

Here, our goal is to keep only interfaces, traits, classes, functions, constants that are greater or equal PHP 5.0.0

Script YourFilters.php
<?php
$closure = function ($data) {
    foreach ($data as $title => &$groups) {
        if (strpos($title, 'CompatibilityAnalyser') === false) {
            continue;
        }
        // looking into Compatibility Analyser metrics only
        foreach ($groups as $group => &$values) {
            if (!in_array($group, array('interfaces', 'traits', 'classes', 'functions', 'constants'))) {
                continue;
            }
            foreach ($values as $name => $metrics) {
                if (version_compare($metrics['php.min'], '5.0.0', 'lt')) {
                    unset($values[$name]);
                }
            }
        }
    }
    return $data;
};
return $closure;
The filter’s file that host the $closure, must be resolvable through the include_path.
Be carefull, with filter source code, or unwanted results may occured.
You have ability to remove definitively (unset), or remove partially (false), values in response through the filter.
Only one filter is allowed at same run, but you can combine one or more analyser rules.

SAPI usage

On CLI, invoke the analyser:run command with the --filter option. E.g:

$ phpcompatinfo analyser:run --filter=YourFilters.php src

On other SAPI, follow example pattern like:

<?php

use Bartlett\Reflect\Client;

// creates an instance of client
$client = new Client();

// request for a Bartlett\Reflect\Api\Analyser
$api = $client->api('analyser');

// perform request, on a data source with default analyser
$dataSource = dirname(__DIR__) . '/src';
$analysers  = array('compatibility');

// filter rules on final results
$closure = function ($data) {
    foreach ($data as $title => &$groups) {
        if (strpos($title, 'CompatibilityAnalyser') === false) {
            continue;
        }
        // looking into Compatibility Analyser metrics only
        foreach ($groups as $group => &$values) {
            if (!in_array($group, array('interfaces', 'traits', 'classes', 'functions', 'constants'))) {
                continue;
            }
            foreach ($values as $name => $metrics) {
                if (version_compare($metrics['php.min'], '5.0.0', 'lt')) {
                    unset($values[$name]);
                }
            }
        }
    }
    return $data;
};

// with embeded $closure code
$metrics = $api->run($dataSource, $analysers, null, false, $closure);

// OR equivalent to CLI command `phpcompatinfo analyser:run --filter=YourFilters.php ../src`
$metrics = $api->run($dataSource, $analysers, null, false, $closure = 'YourFilters.php');