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    <p>This is a possible solution for your problem, though I would recommend a re-construction as Patashu &amp; 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 $key=&gt;$date ) { if ($key&gt;0) { if ($date[0] === $dates[$key-1][0]) { $dates[$key][0] = ""; } else if($dates[$key-1][0] === "") { for ($i = $key-1; $i &gt; -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 $index=&gt;$date ) { if (!array_key_exists($date[0], $constructed)) { $constructed[$date[0]] = array("index"=&gt;$index, "value"=&gt;$date[1]); } else { array_push($constructed[$date[0], ["index"=&gt;$index,"value"=&gt;$date[1]]); } } return $constructed; } //Output: ["June 4"=&gt; [["index"=&gt;0, "value"=&gt;30], ["index"=&gt;1, "value"=&gt;35]], "June 5"=&gt;[["index"=&gt;2, "value"=&gt;46], ["index"=&gt;3, "value"=&gt;38.33], ["index"=&gt;4, "value"=&gt;12]]] </code></pre> <p>Note: Added index in recommended solution if a more accurate re-construction is needed.</p>
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    1. POPHP remove duplicate instances of dates in an array
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    1. COThe nested loop in this solution will start to take a long time if the data set gets very large - it's an O(n^2) algorithm
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    2. COFor your recommended solution, how does he get it back to the format he needs for charting?
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    3. COAdded a break solution for better performance. And for the second comment, it would not be possible to get them in the same position, unless you added each index inside each value.
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