[greenzilla]

FUNCTION:

function escape_array($arr){
    global $wpdb;
    $escaped = array();
    foreach($arr as $k => $v){
        if(is_numeric($v))
            $escaped[] = $wpdb->prepare('%d', $v);
        else
            $escaped[] = $wpdb->prepare('%s', $v);
    }
    return implode(',', $escaped);
}

USAGE:

$arr = array('foo', 'bar', 1, 2, 'foo"bar', "bar'foo");

$query = "SELECT values
FROM table
WHERE column NOT IN (" . escape_array($arr) . ")";

echo $query;

RESULT:

SELECT values
FROM table
WHERE column NOT IN ('foo','bar',1,2,'foo\"bar','bar\'foo')

May or may not be more efficient, however it is reusable.

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