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<?php $data = [ 'Newcastle Upon Tyne, Tyne and Wear, England' => 18, 'Gateshead, Tyne and Wear, England' => 17, 'Sunderland, Tyne and Wear, England' => 3, ]; $result = []; foreach($data as $key=>$value){ $result[explode(',',$key)[0]] = $value; } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [Newcastle Upon Tyne] => 18 [Gateshead] => 17 [Sunderland] => 3 )

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