K2 custom meta based on extrafields

gistfile1.php

<?php
  // Option 1 - content is already cleaned up.
	// if AAA is set use it, else use BBB
	$metacontent = ( isset($this->item->extraFields->AAA->value) && $this->item->extraFields->AAA->value != '' ) ? $this->item->extraFields->AAA->value : $this->item->extraFields->BBB->value;
	$doc->addCustomTag('<meta name="anything" content="'.$metacontent.'" />');
?>

<?php // option two the content needs cleaning

  // Clean the content prior to the assignment 
  $safe 		= array("&#39;", "&#34;");
  $nonsafe 	= array("'", "\"");
  
  // Cleanit up
  $fieldone  = (isset($this->item->extraFields->AAA->value) ? str_replace( $nonsafe, $safe, $this->item->extraFields->AAA->value ) : '' );
  $fieldtwo  = (isset($this->item->extraFields->BBB->value) ? str_replace( $nonsafe, $safe, $this->item->extraFields->BBB->value ) : '' );
  
  // Assign the meta's content
	$metacontent = ( isset($fieldone) && $fieldone != '' ? $fieldone : $fieldtwo );
	$doc->addCustomTag('<meta name="anything" content="'.$metacontent.'" />');
?>