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<?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 for git.master, git.master_jit, rfc.property-hooks
array(3) { ["SO30"]=> array(2) { [0]=> string(4) "SO30" [1]=> string(4) "SO30" } ["SO31"]=> array(1) { [0]=> string(4) "SO31" } ["RG51"]=> array(2) { [0]=> string(4) "RG51" [1]=> string(4) "RG51" } }

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