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Removing the current node's ID from an array of node IDs

Didn't work:

<?php
  // Remove the current node ID, if present.  This looks crazy but it's fast,
  // see http://lixlpixel.org/php-benchmarks/remove-array-items-by-value
  if ($nids) {
    $nids = explode(',', str_replace($current_nid . ',', '', join(',', $nids)));
  }
?>

Worked:

<?php
  // Remove the current nid if present.
  if ($nids) {
    $key = array_search($current_nid, $nids);
    if ($key !== FALSE) {
      unset($nids[$key]);
    }
  }
?>

Searched words: 
cut excise delete get rid of present NID

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