utils.php
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			<?php

			/**
			* Look up the type of a PHID. Returns
			* PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN if it fails to look up the type
			*
			* @param phid $phid Anything.
			* @return string A value from PhabricatorPHIDConstants (ideally)
			*/
			function phid_get_type($phid) {
			$matches = null;
			if (is_string($phid) && preg_match('/^PHID-([^-]{4})-/', $phid, $matches)) {
			return $matches[1];
			}
			return PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN;
			}

			/**
			* Group a list of phids by type.
			*
			* @param $phids Array of phids
			* @return map of phid type => list of phids
			*/
			function phid_group_by_type($phids) {
			$result = array();
			foreach ($phids as $phid) {
			$type = phid_get_type($phid);
			$result[$type][] = $phid;
			}
			return $result;
			}

			function phid_get_subtype($phid) {
			if (isset($phid[14]) && ($phid[14] == '-')) {
			return substr($phid, 10, 4);
			}
			return null;
			}

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