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    <p>The most robust way to go about this is to use <code>DateTime</code> instead of <code>strtotime</code>:</p> <pre><code>$now = new DateTime( "7 days ago", new DateTimeZone('America/New_York')); $interval = new DateInterval( 'P1D'); // 1 Day interval $period = new DatePeriod( $now, $interval, 7); // 7 Days </code></pre> <p>Now, you can form your array of dates like so:</p> <pre><code>$sale_data = array(); foreach( $period as $day) { $key = $day-&gt;format( 'M d'); $sale_data[ $key ] = 0; } </code></pre> <p>This <a href="http://codepad.viper-7.com/MDpsY8">initializes your array</a> to something like:</p> <pre><code>array(8) { ["Jun 18"]=&gt; int(0) ["Jun 19"]=&gt; int(0) ["Jun 20"]=&gt; int(0) ["Jun 21"]=&gt; int(0) ["Jun 22"]=&gt; int(0) ["Jun 23"]=&gt; int(0) ["Jun 24"]=&gt; int(0) ["Jun 25"]=&gt; int(0) } </code></pre> <p>Now you have an array with all of the possible dates in the past 7 days, and you can do this in your loop:</p> <pre><code>$display_date = date('M d', $sale['created']); $sale_data[$display_date] += $sale['amt']; </code></pre> <p>You do not need to check if the array key exists, as it is guaranteed to exist.</p> <p>Finally, I would recommend looking into the <code>DATETIME</code> or other associated date/time column types, as they would be of more use here than storing UNIX timestamps. You could be using MySQL date/time functions to properly select the rows you're looking for instead of having to create a UNIX timestamp every time you want to query for data based on time.</p>
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    1. POHow to get last 7 days using PHP
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    1. POHow to get last 7 days using PHP
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    1. CO`new DateTime('7 days ago');` would do the trick too.
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    2. CO+1 for recommending `DateTime`. I see waaay too many answers using `strtotime`. DateTime is object oriented and unless you're using PHP < 5.2.0, there's no sense using the old date/time functions anymore. IMHO
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