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@ 2015-09-22T13:39:18Z

<?php

$tsid = '-123';
    if (!filter_var($tsid, FILTER_VALIDATE_INT, 0) || (intval($tsid) < 0)) {
      form_set_error('tsid', t('TSID must be positive number.'));
    }

Output
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filter_var: documentation ( source)

preferences:dark modelive preview

44.03 ms | 402 KiB | 5 Q