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use eZ\Publish\Core\FieldType\Keyword\Value;
 
// Instantiates a Value object with an array of keywords
$keywordValue = new Value( array( "php5", "css3", "html5", "solr", "memcached" ) );
 
// Instantiates a Value object with a list of keywords in a string
// This is equivalent to the example above
$keywordValue = new Value( "php5,css3,html5,solr,memcached" );