php mysql fulltext search against array
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I have an array of strings and I want to search them in mysql table.

this is the query working with one string 

    $string = "searchterm";
    $sql = "SELECT * From info WHERE MATCH (title, authors, abstract, keywords) AGAINST($string) > 0 GROUP BY id LIMIT 0, 20";

but now I have an array instead of one string. how to handle that?

    $strings = array ("search1","search2"...);