检查邮政编码是否在多个阵列中？

I have 3 different areas, MyArea1, MyArea2, MyArea3. Each of these have an array of postcodes:

$myArea1=array("AB1","AC2","AD1");
$myArea2=array("BC1","BC2","BC3");
$myArea3=array("CD1","CD2","CD3");

The postcodes I need to check would be like the following "BC2 4YZ".

The following won't work as it checks for a complete match:

if (in_array($row['postcode'], $myArea1)) { $Area = 'Area 1'; }
else if (in_array($row['postcode'], $myArea2)) { $Area = 'Area 2'; }    
else if (in_array($row['postcode'], $myArea3)) { $Area = 'Area 3'; }
else { $Area = 'No Match'; }

I've got the following that works:

foreach ($myArea1 as $myArea1pc) {
    if (strpos($row['postcode'],$myArea1pc) !== false) {
        $Area = 'Area 1';                   
    }
}

However is there a way of looping this for all of my arrays?

Edit: There may sometimes be postcodes such as "BC24" in my arrays.

I would try to use in_array for this.

$input = $row['postcode'];

$areas = array(
    'Area 1' => array("AB1","AC2","AD1"),
    'Area 2' => array("BC1","BC2","BC3"),
    'Area 3' => array("CD1","CD2","CD3"),
);

// Take out the first 3 letter:
$part = substr(trim(str_replace(' ', '', $input)), 0, -3);

$Area = 'No match';
// Find which "area" array contains it
foreach ($areas as $k => $v) {
    if (in_array($part, $v)) {
        $Area = $k;
        break;
    }
}