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    copied!<p>If you really need to do it this way, you could do something like the following:</p> <pre><code>foreach($arrayB as $bRow) { if(FALSE !== ($key = array_search($bRow, $arrayA)) { $arrayC[] = $arrayA[$key+1]; } } </code></pre> <p>However, a string-indexed array would probably be better for Array A. Use the following for the 3 examples below:</p> <pre><code>$arrayA = array("2012-08-01" =&gt; 1, "2012-08-03" =&gt; 1, "2012-08-07" =&gt; 2, "2012-08-09" =&gt; 2, "2012-08-27" =&gt; 1); $arrayB = array("2012-09-04", "2012-09-06", "2012-09-08", "2012-09-10"); $arrayC = array(); </code></pre> <p>If Array A always contains more elements than Array B (or the same number):</p> <pre><code>foreach($arrayA as $key=&gt;$value) { if(in_array($key, $arrayB)) { $arrayC[] = $value; } } </code></pre> <p>If Array B always contains more elements than Array A (or the same number):</p> <pre><code>foreach($arrayB as $bRow) { if(isset($arrayA[$bRow])) { $arrayC[] = $arrayA[$bRow]; } } </code></pre> <p>If it is possible that sometimes Array A is longer and sometimes Array B is longer:</p> <pre><code>$matchedIndexes = array(); foreach($arrayA as $key=&gt;$value) { if(in_array($key, $arrayB)) { $arrayC[] = $value; $matchedIndexes[] = $key; } } foreach($arrayB as $bRow) { // Only add the entries that we did not already add when looping through $arrayA if(!in_array($key, $matchedIndexes) &amp;&amp; isset($arrayA[$bRow])) { $arrayC[] = $arrayA[$bRow]; } } </code></pre> <p>Populating arrayC with zeros foreach entry in arrayA that does not have a match in arrayB:</p> <pre><code>foreach($arrayA as $key=&gt;$value) { if(in_array($key, $arrayB)) { $arrayC[] = $value; } else { $arrayC[] = 0; } } </code></pre>
 

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