1、此函数的作用：去除数组中重复的元素并按键名排序
function assoc_unique($arr, $key) {
$tmp_arr = array();
foreach($arr as $k => $v) {
if(in_array($v[$key], $tmp_arr)) {
unset($arr[$k]);
} else {
$tmp_arr[] = $v[$key];
}
}
sort($arr);
return $arr;
}

使用例子:
$aa = array(
array("id" => 123, "name" => "张三"),
array("id" => 123, "name" => "李四"),
array("id" => 124, "name" => "王五"),
array("id" => 125, "name" => "赵六"),
array("id" => 126, "name" => "赵六")
);
$key = "id";
assoc_unique(&$aa, $key);
print_r($aa);