Question

Now I have

Array(1 => Array("aaa","bbb","ccc"))
Array(2 => Array("eee","fff","ggg","hhh"))

And I want to make a String

$a = "ST_Union(ST_Union('aaa','bbb'),'ccc')" 
$b = "ST_Union(ST_Union(ST_Union('eee','fff'),'ggg'),'hhh')"

How could I done this in PHP ?

Answer 1

UPD: updated solution a little, now much more simple and readable:

http://ideone.com/tdIXT

function wrapWithUnion(array $params)
{
    if (is_null($params[0])) {
        return "'{$params[1]}'";
    }

    return "ST_Union({$params[0]},'{$params[1]}')";
}

$arr = array("eee","fff","ggg","hhh");

$result = null;

foreach ($arr as $val) {
    $result = wrapWithUnion(array($result, $val));
}

var_dump($result);