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20141107.phriction.popkeys.php
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			<?php

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

			echo pht('Populating Phriction mailkeys.')."\n";

			foreach (new LiskMigrationIterator($table) as $doc) {
			$id = $doc->getID();

			$key = $doc->getMailKey();
			if ((strlen($key) == 20) && (strpos($key, "\0") === false)) {
			// To be valid, keys must have length 20 and not contain any null bytes.
			// See T6487.
			echo pht('Document has valid mailkey.')."\n";
			continue;
			} else {
			echo pht('Populating mailkey for document %d...', $id)."\n";
			$mail_key = Filesystem::readRandomCharacters(20);
			queryfx(
			$conn_w,
			'UPDATE %T SET mailKey = %s WHERE id = %d',
			$table->getTableName(),
			$mail_key,
			$id);
			}
			}

			echo pht('Done.')."\n";