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@ 2017-10-05T10:56:38Z

<?php

$postcodes = ['SO30 0NG', 'SO30 OTD', 'SO31 1TG', 'RG51 5HG', 'RG51 7GH'];

$result= array();
Foreach ($postcodes as $postcode){
    $short =Substr($postcode,0,4);
    If(!isset($result[$short])) $result[$short]=[];
    
    $result[$short][]= $short;
}

Var_dump($result);

Output
Performance
VLD
References
Branches

substr: documentation ( source)
var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

120.48 ms | 405 KiB | 5 Q