PHP数组的操作（新建，取下标，内容）
新建数组方法之一：
$cs2 = array("100"=>"全部","101"=>"云浮","102"=>"肇庆","103"=>"广州");
print_r($cs2);
print_r(array_keys($cs2));输出：
Array ( [100] => 全部 [101] => 云浮 [102] => 肇庆 [103] => 广州 ) Array ( [0] => 100 [1] => 101 [2] => 102 [3] => 103 )
也可以用：
$cs2 = array("全部","云浮","肇庆","广州");输出：Array ( [0] =>全部 [1] =>云浮 [2] => 肇庆 [3] => 广州 ) 对数组下标的操作：
$arr=array();
$arr["aa"]["a"]="w";
$arr["bb"]["b"]="x";
$arr["cc"]["c"]="y";
$arr["dd"]["d"]="z";
print_r($arr);
echo "<br />";
foreach( array_keys($arr) as $k1 ) {
foreach( array_keys($arr[$k1]) as $k2 ) {
echo "key1:"$k1" key2:"$k2"<br />";
}
}输出结果：
Array ( [aa] => Array ( [a] => w ) [bb] => Array ( [b] => x ) [cc] => Array ( [c] => y ) [dd] => Array ( [d] => z ) ) key1:"aa" key2:"a" key1:"bb" key2:"b" key1:"cc" key2:"c" key1:"dd" key2:"d"
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