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 Anything.
	* @return 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. Given:
	*
	* phid_group_by_type([PHID-USER-1, PHID-USER-2, PHID-PROJ-3])
	*
	* phid_group_by_type would return:
	*
	* [PhabricatorPHIDConstants::PHID_TYPE_USER => [PHID-USER-1, PHID-USER-2],
	* PhabricatorPHIDConstants::PHID_TYPE_PROJ => [PHID-PROJ-3]]
	*
	* @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;
	}