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<?phpif ($xml = simplexml_load_file('http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&retmax=0&usehistory=y&term=' . urlencode($argv[1]))){  if ($xml = simplexml_load_file("http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esummary.fcgi?db=pubmed&retmode=xml&query_key={$xml->QueryKey}&WebEnv={$xml->WebEnv}&retstart=0&retmax=10")){    $docs = $xml->xpath('//DocSum');  }}print_r($docs);?>