请教 要求x包含y,x按y排序
怎么说呢，其实就是要求x包含y,x按y排序
比较x和y两个数组，
如果x长度大于y，则将x数组中多出的键追加到y数组后面
例如：
$x = array(0=>'a', 1=>'b', 2=>'c', 3=>'d', 4=>'e');
$y = array(2=>'c', 4=>'e', 0=>'a');
则结果为 array(2=>'c', 4=>'e', 0=>'a', 1=>'b', 3=>'d');
如果x长度小于y，则先将y数组中多出的键删除
$x = array(0=>'a', 1=>'b');
$y = array(2=>'c', 4=>'e', 0=>'a');
则结果为 array(0=>'a', 1=>'b');
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