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<?php $inventory = array( array("fruit"=>"orange", "price"=>3), array("fruit"=>"kiwi", "price"=>2), array("fruit"=>"apple", "price"=>3), array("fruit"=>"apple", "price"=>3), array("fruit"=>"apple", "price"=>3), array("fruit"=>"orange", "price"=>3), array("fruit"=>"banana", "price"=>10), array("fruit"=>"banana", "price"=>10), ); function groupFruits(&$result, $item) { $key = $item['fruit']; @$result[$key] += $item['price']; return $result; } $grouped = array_reduce($inventory, 'groupFruits', array()); arsort($grouped); print_r($grouped);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Warning: groupFruits(): Argument #1 ($result) must be passed by reference, value given in /in/Bus6m on line 24 Array ( [banana] => 20 [apple] => 9 [orange] => 6 [kiwi] => 2 )

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