sort对数组进行排序
bool sort(array &$array[,int $sort_flags = SORT_REGULAR]);当该函数运行结束时，数组单元将被从最低到最高重新排列。 sort_flags可选的第二个参数可以用一下值改变排序的行为：
SORT_REGULAR //正常比较单元（不改变类型）SORT_NUMERIC //单元被作为数字进行比较SORT_STRING //单元被作为字符串进行比较//根据当前的区域（locale）设置来把单元当作字符串比较，可以用setlocale()来改变SORT_LOCALE_STRING //和natsort()类似对每个单元以“自然的顺序”对字符串进行排序SORT_NATURAL //能够与SORT_STRING 或SORT_NATURAL合并（OR位运算），不区分大小写排序字符串SORT_FLAG_CASE相关例子
$numbers = array(24,19,3,16,56,8,171,9);sort($numbers);var_dump($numbers);//输出array(8) { [0]=>int(3) [1]=>int(8) [2]=>int(9) [3]=>int(16) [4]=>int(19) [5]=>int(24) [6]=>int(56) [7]=>int(171)}sort($numbers,SORT_STRING);PRint_r($numbers);//输出Array( [0] => 16 [1] => 171 [2] => 19 [3] => 24 [4] => 3 [5] => 56 [6] => 8 [7] => 9)//混合数组$mixed = array(24,"dog","cat",19,3,56,8,171,"bruce","nemo");sort($mixed);print_r($mixed);//输出Array( [0] => bruce [1] => cat [2] => dog [3] => nemo [4] => 3 [5] => 8 [6] => 19 [7] => 24 [8] => 56 [9] => 171)sort($mixed,SORT_REGULAR);print_r($mixed);//输出Array( [0] => bruce [1] => cat [2] => dog [3] => nemo [4] => 3 [5] => 8 [6] => 19 [7] => 24 [8] => 56 [9] => 171)sort($mixed,SORT_NUMERIC);print_r($mixed);//输出Array( [0] => nemo [1] => dog [2] => cat [3] => bruce [4] => 3 [5] => 8 [6] => 19 [7] => 24 [8] => 56 [9] => 171)sort($mixed,SORT_STRING);print_r($mixed);//输出Array( [0] => 171 [1] => 19 [2] => 24 [3] => 3 [4] => 56 [5] => 8 [6] => bruce [7] => cat [8] => dog [9] => nemo)新闻热点
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