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copied!<p>This is a possible solution for your problem, though I would recommend a re-construction as Patashu & Nikola R stated.</p> <pre><code>$untrimmed = [["June 4",30],["June 4",35],["June 5",46],["June 5",38.33],["June 5",12]]; $trimmed = stripDates($untrimmed); function stripDates($dates) { foreach( $dates as $key=>$date ) { if ($key>0) { if ($date[0] === $dates[$key-1][0]) { $dates[$key][0] = ""; } else if($dates[$key-1][0] === "") { for ($i = $key-1; $i > -1; $i--) { if ($date[0] === $dates[$i][0]) $dates[$key][0] = ""; if ($dates[$key] != "") break; } } } } return $dates; } // Note: This would require dates to be added chronically //Output: ["June 4",30],["",35],["June 5",46],["",38.33],["",12] </code></pre> <p>I would recommend something like this:</p> <pre><code>$unconstructed = [["June 4",30],["June 4",35],["June 5",46],["June 5",38.33],["June 5",12]]; $constructed = constructAssoc($unconstructed); function constructAssoc($dates) { $constructed = array(); foreach( $dates as $index=>$date ) { if (!array_key_exists($date[0], $constructed)) { $constructed[$date[0]] = array("index"=>$index, "value"=>$date[1]); } else { array_push($constructed[$date[0], ["index"=>$index,"value"=>$date[1]]); } } return $constructed; } //Output: ["June 4"=> [["index"=>0, "value"=>30], ["index"=>1, "value"=>35]], "June 5"=>[["index"=>2, "value"=>46], ["index"=>3, "value"=>38.33], ["index"=>4, "value"=>12]]] </code></pre> <p>Note: Added index in recommended solution if a more accurate re-construction is needed.</p>

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