php chebox filter

function parseMysqlQuery($array) {

$output = ''; foreach( $array as $key => $value){

   $output .= !$output ? " WHERE $table.$key " : " AND $table.$key";
   $output .= ' IN ("' . implode('","', $value) . '")';
}
echo "Key: $key; Value: $value<br />\n";
return $output;
}

$array = (array)filter_input_array(INPUT_POST, array( "num" => array( 'filter' => FILTER_SANITIZE_STRING, 'flags' => FILTER_FORCE_ARRAY, ),

'grupo' => array(
    'filter' => FILTER_SANITIZE_STRING,
    'flags'  => FILTER_FORCE_ARRAY,
),

'dt_de_inducao' => array(
    'filter' => FILTER_SANITIZE_STRING,
    'flags'  => FILTER_FORCE_ARRAY,
),
));

//SELECT TABLE_NAME FROM information_schema.tables WHERE table_schema = 'folha_tarefa' if ($_SERVER['REQUEST_METHOD'] == "POST") { $array = array_filter($array);

$in = parseMysqlQuery($array);

$query = "SELECT * FROM contratos " . $in;

This is a filter with checkbox, but I have a search that I do a join left and I'm not able to make my php understand what table to look for, ex nameable.nomecolumn