public PoMetadataInterface::setHeader(PoHeader $header)
Set header metadata.
\Drupal\Component\Gettext\PoHeader $header: Header object representing metadata in a PO header.
public function setHeader(PoHeader $header);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Component!Gettext!PoMetadataInterface.php/function/PoMetadataInterface::setHeader/8.1.x