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    <p>If this array was assigned to variable <code>$ary</code> like:</p> <pre><code>$ary = array( 'estimated' =&gt; array( array('TITLE' =&gt; 'MAIN', 'CURR_PERF' =&gt; 100, 'POT_PERF' =&gt; 75), array('TITLE' =&gt; 'HEAT', 'CURR_PERF' =&gt; 90, 'POT_PERF' =&gt; 60), array('TITLE' =&gt; 'CO2', 'CURR_PERF' =&gt; 56, 'POT_PERF' =&gt; 40), ), 'actual' =&gt; array( array('TITLE' =&gt; 'MAIN', 'CURR_PERF' =&gt; 100, 'POT_PERF' =&gt; 75), array( 'TITLE' =&gt; 'HEAT', 'CURR_PERF' =&gt; 89 , 'POT_PERF' =&gt; 75), array( 'TITLE' =&gt; 'CO2', 'CURR_PERF' =&gt; 40, 'POT_PERF' =&gt; 20 ), ); ); </code></pre> <p>Your <code>estimated</code> array could be accessed like:</p> <pre><code>$newVar = $ary['estimated'][2]['CURR_PERF']; </code></pre> <p><code>$newVar</code> would be <code>56</code>. You can reassign a value as well, like:</p> <pre><code>$ary['estimated'][0]['POT_PERF'] = 300; </code></pre> <p>That first array in the <code>estimated</code> array used to be <code>75</code> and is now <code>300</code>.</p> <p>This is how you get and set specific values in a Multi-dimensional Array.</p> <p>To sort the arrays, if you need to loop over and maintain their indexes, see PHP's <code>uasort()</code> function. This may take some work, on your part, to develop a <code>cmp_function</code>, but should do what you're looking for in a different way.</p> <p>See, </p> <p><a href="http://www.php.net/manual/en/function.uasort.php" rel="nofollow">http://www.php.net/manual/en/function.uasort.php</a></p> <p>and</p> <p><a href="http://www.php.net/manual/en/function.usort.php" rel="nofollow">http://www.php.net/manual/en/function.usort.php</a> ,</p> <p>which explains <code>cmp_function</code> better.</p>
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    1. POAccessing multi-dimensional, unordered, associative arrays in an ordered fashion using an incremental loop
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    1. COI fear you've misunderstood the question somewhat, I understand how to access the data. (That should be quite evident from the question itself!) This primarily regards things such as accessing nested associative arrays without knowing the order, and preferably without any further data structures or excess flow control structures.
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      1. USFergus In London
    2. COMaybe you should look into `uasort()` at http://www.php.net/manual/en/function.uksort.php and `usort()` at http://www.php.net/manual/en/function.usort.php, because it explains `cmp_function`.
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