sorting - I need to sort by price, and then by time for identical prices multidimensional associated array -


i need sort price, , things identical prices. have sort price. here array , sort have:

<?php $a = array(             1 => array('price' => 9.25, 'timestamp_added' => 1301945848, 'name' => 'pencils'),             4 => array('price' => 19.15, 'timestamp_added' => 1299267448, 'name' => 'crayon box'),             15 => array('price' => 4.25, 'timestamp_added' => 1299785848, 'name' => 'markers'),             2 => array('price' => 4.28, 'timestamp_added' => 1299785848, 'name' => 'eraser'),             44 => array('price' => 13.99, 'timestamp_added' => 1299872248, 'name' => 'trapper'),             32 => array('price' => 9.25, 'timestamp_added' => 1299872248, 'name' => 'notebook'),             14 => array('price' => 13.99, 'timestamp_added' => 1301945848, 'name' => 'sharpener'),             5 => array('price' => 15.01, 'timestamp_added' => 1299872248, 'name' => 'calculator'),             60 => array('price' => 15.01, 'timestamp_added' => 1397433600, 'name' => 'calculator'),             70 => array('price' => 15.01, 'timestamp_added' => 1293840000, 'name' => 'calculator'),             80 => array('price' => 15.01, 'timestamp_added' => 1363132800, 'name' => 'calculator')         );  function printlist($a) {             echo "<br><br> printing array: <br>";             foreach ($a $key => $value) {                 echo "<br /> product id $key <b>price:</b> $" . $value['price'] . " <b>timestamp:</b> "                 . $value['timestamp_added'] . " <b>name:</b> " . $value['name'] . " <b>date added: </b>" . date('m d, y', $value['timestamp_added']);             }         }          $sortbyprice = function ($a, $b) {                     return ($a['price'] >= $b['price']) ? 1 : 0;                 };         printlist($a);         echo "<br><br>sorting price...";         uasort($a, $sortbyprice);         printlist($a);         ?>

how sort timestamp if prices identical? have been trying change sortbyprice function that. should have 2 sorting functions, or 1 better sorting function? how do this?

why not extend in sortbyprice anon function comparing timestamp if prices equal? such follows: 

$sortbyprice = function ($a, $b) {                    if($a['price'] == $b['price']){                        return ($a['timestamp_added'] >= $b['timestamp_added']) ? 1 : 0;                    }                    else{                        return ($a['price'] >= $b['price']) ? 1 : 0;                    }             };

cheers,


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