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(PECL solr >= 0.9.2)
SolrQuery::setHighlightSimplePre — Sets the text which appears before a highlighted term
$simplePre 
   [,  string $field_override 
  ] )Sets the text which appears before a highlighted term
The default is <em>
simplePre The text which appears before a highlighted term
field_override The name of the field.
Returns the current SolrQuery object, if the return value is used.