编辑： H3>

我已经尝试加入表格，在php中使用strtotime对它们进行排序..但我似乎无法获得语法。玩这个代码..但它变得非常复杂，我希望我可以在纯SQL中更容易。它不完整，但是..你可以看到我在想什么。

mysql_connect("localhost","root","");

mysql_select_db("project");

$SSN = utf8_decode(strip_tags($_GET['ssn']));

//firstname,lastname, email, phone, address, zipcode, district

$result = mysql_query("SELECT *

FROM CARS

WHERE CARS.SSN = '$SSN'");

$result2 = mysql_query("SELECT *

FROM ELECTRONICS

WHERE ELECTRONICS s.SSN = '$SSN'");

if (!$result) {

echo 'Could not run query: ' . mysql_error();

exit;

}

while($obj = mysql_fetch_object($result)) {

$arr[] = $obj;

}

echo '{"users":'.json_encode($arr).'}';

if (!$result2) {

echo 'Could not run query: ' . mysql_error();

exit;

}

while($obj = mysql_fetch_object($result2)) {

$arr[] = $obj;

}

echo '{"users":'.json_encode($arr).'}';

function mysort($a, $b) {

return(strtotime($b['datePosted']) - strtotime($a['datePosted']));

}

// pre-sort:

echo "

Before:\n";

print_r($arr);

// do the sort:

usort($arr, 'mysort');

// show the result:

echo "After:\n";

print_r($arr);

echo "

";

?>