PHP agent v6.4.0.163

Ignore Errors
A new newrelic.error_collector.ignore_errors setting has been added. When configured, this setting can be used to prevent errors, such as E_WARNING, from being reported to New Relic. This setting does not affect errors reported via the newrelic_notice_error API.
Ignore Exceptions
A new newrelic.error_collector.ignore_exceptions setting has been added. This setting accepts a comma-separated list of fully-qualified class names. When an uncaught exception occurs, the agent will not report the exception to New Relic if it is an instance of a class in this list. This setting does not affect errors reported via the newrelic_notice_error API.

Guzzle support is now enabled by default. It can be disabled by setting the new newrelic.guzzle.enabled setting to false.
The guzzle feature flag that was previously used to enable Guzzle support is now ignored.

The first request in each PHP process would remove any output handlers installed using the output_handler configuration setting for users of PHP 5.4 and later. This has been fixed: existing output handlers will now remain untouched.
Transient WordPress hooks now have the unique numbers removed from their names to avoid metric grouping issues.
In cases where WordPress' WP_CONTENT_DIR directory was set to a custom value, WordPress plugin metrics were not reported on PHP 5.2 to 5.4, inclusive. This affected users of the popular WP-Skeleton project. This has been fixed.
A regression in version 6.3 could cause Guzzle 6 users to lose support for cross application tracing and service maps, in particular when Guzzle 6 was autoloaded as a result of instantiating the only GuzzleHttp\Client object used within the lifetime of the script. This has been fixed.