数组分类和示例

普通一维数组
array("a","b","c","d")(它也是数字索引数组)

索引数组（数字索引数组，键值索引数组
数字索引数
array(0 =>"a",1=>"b",2=>"c",3=>"d")

键值索引数
array("a"=>"a","b"=>"b","c"=>"c","d"=>"d")

三维数组
array(
     array("a0","b0","c0","d0"),
     array("a1","b1","c1","d1"),
     array("a2","b2","c2","d2")
     )

array(
     array("0"=>"a0","1"=>"b0","2"=>"c0","3"=>"d0"),
     array("0"=>"a1","1"=>"b1","2"=>"c1","3"=>"d1"),
     array("0"=>"a2","1"=>"b2","2"=>"c2","3"=>"d2")
     )

array(
     array("a0"=>"a0","b0"=>"b0","c0"=>"c0","d0"=>"d0"),
     array("a1"=>"a1","b1"=>"b1","c1"=>"c1","d1"=>"d1"),
     array("a2"=>"a2","b2"=>"b2","c2"=>"c2","d2"=>"d2")
     )


数组的foreach及for的使用；
foreach($arrayt as $k1 => $v1)
    {
    echo $k1 ."-". $v1 ."<br />";
    foreach($v1 as $k2 => $v2){
        echo $k2 ."-". $v2 ."<br />";
        }
    }