How to get rid of duplicate elements in an array?

Question

PHP

<?
include('config.php');
$link = mysql_connect($config[host], $config[db_user], $config[db_pass])
or die("Could not connect: " . mysql_error());
mysql_select_db($config[db_name]);
mysql_set_charset('utf8');
$xml_currency = mysql_query("SELECT * FROM `currency`  WHERE   `status` = '1' ");
while($xml_currency_row = mysql_fetch_assoc($xml_currency)){
$cy[] = array("name_xml" => $xml_currency_row[xml_k],"type" => $xml_currency_row[com_type],"id" => $xml_currency_row[id],"rez"=> $xml_currency_row[reserve], "stavka" => $xml_currency_row[com]);
}

$dir_sql = mysql_query("SELECT * FROM `direction`  WHERE `give` = '12' AND `status` = '1'  ");

while($dir_row = mysql_fetch_assoc($dir_sql))
{ 
$float = number_format($dir_row['get_course'], 4, '.', '');
$float1 = number_format($dir_row['give_course'], 4, '.', '');
$lol['1'][$dir_row['get']]   =  array( 'in_min_amount' => floatval($dir_row[min_amount]));
if($float1 > '1')
{
$lol['1'][$dir_row['get']]['in']  =round($float1,4);	
}
else if($float1 < 1)
{
$t = 1 / $float1;
$lol['1'][$dir_row['get']][out]  =round($t,4);	
}
if($float > '1')
{
$lol['1'][$dir_row['get']][out]  =round($float,4);	
}
else  if($float < 1)
{
$t1 = 1 / $float;
$lol['1'][$dir_row['get']][out]  =round($t1,4);	
}

$cy_dir = array("to" => $lol['1']);

}



  


echo json_encode(($cy_dir),JSON_PRESERVE_ZERO_FRACTION );

?>

{"to":{"10":{"in_min_amount":0.01,"out":7050.18},"11":{"in_min_amount":0.01,"out":7012.31},"13":{"in_min_amount":0.01,"out":13.09},"20":{"in_min_amount":0.01,"out":226523.9172},"18":{"in_min_amount":0.15,"out":7350.4542},"16":{"in_min_amount":0.0075,"out":6811.87}}}

Answer 1

What is the criterion for repeating array elements? Should two array elements be exactly equal, or only one of the element fields?