testing

20160604.user.01.stringmailprefs.php
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			<?php


			$table = new PhabricatorUserPreferences();
			$conn_w = $table->establishConnection('w');

			// Convert "Mail Format", "Re Prefix" and "Vary Subjects" mail settings to
			// string constants to avoid weird stuff where we store "true" and "false" as
			// strings in the database.

			// Each of these keys will be converted to the first value if present and
			// truthy, or the second value if present and falsey.
			$remap = array(
			'html-emails' => array('html', 'text'),
			're-prefix' => array('re', 'none'),
			'vary-subject' => array('vary', 'static'),
			);

			foreach (new LiskMigrationIterator($table) as $row) {
			$dict = $row->getPreferences();

			$should_update = false;
			foreach ($remap as $key => $value) {
			if (isset($dict[$key])) {
			if ($dict[$key]) {
			$dict[$key] = $value[0];
			} else {
			$dict[$key] = $value[1];
			}
			$should_update = true;
			}
			}

			if (!$should_update) {
			continue;
			}

			queryfx(
			$conn_w,
			'UPDATE %T SET preferences = %s WHERE id = %d',
			$table->getTableName(),
			phutil_json_encode($dict),
			$row->getID());
			}

			$prefs_key = PhabricatorUserPreferencesCacheType::KEY_PREFERENCES;
			PhabricatorUserCache::clearCacheForAllUsers($prefs_key);