数组的应用

创建数组
$arr = array (3,5,7,9,6);
$arr = array ("id"=>2,"title"=>3);


修改数组
$arr = array("a" => "视频", "b"=>"教程", "c" => "六");
$arr['a']    = "PHP100";
$arr['c']    = "第六讲";


统计数组条数
count($arr);


判断数组
is_array($arr);


explode分割创建数组并显示6827
$a="133-6827-5888";
$arr=explode("-",$a);
echo $arr[1];


遍历数组显示0-1980.....
$arr=array(1980,1981,1982,1983,1984);
foreach($arr as $key=>$value){
echo $key."-".$value;
}