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<?php $file = [ [0, 'a', 1, 2], [0, 'a', 1, 2], [0, 'b', 1, 2], ]; $fieldNames = [ 'id', 'location', 'blankets', 'sleepingbags' ]; $sumBlankets = []; foreach ($file as $i => $line) { $row = array_combine($fieldNames, $line); $k = $row['location']; // important if (!array_key_exists($k, $sumBlankets)) { $sumBlankets[$k] = ['blankets'=>0, 'sleepingbags'=>0]; } $sumBlankets[$k]['blankets'] += $row['blankets']; $sumBlankets[$k]['sleepingbags'] += $row['sleepingbags']; } var_export( $sumBlankets );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'a' => array ( 'blankets' => 2, 'sleepingbags' => 4, ), 'b' => array ( 'blankets' => 1, 'sleepingbags' => 2, ), )

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