2<hr>array(5) {
  [0]=>
  int(2)
  [1]=>
  int(3)
  [2]=>
  int(4)
  [3]=>
  int(5)
  [4]=>
  string(5) "hello"
}
<hr>Array
(
    [0] => 2
    [1] => 3
    [2] => 4
    [3] => 5
    [4] => hello
    [100] => 99
    [50] => 49
)
<hr>array(3) {
  ["yuwen"]=>
  string(2) "90"
  ["shuxue"]=>
  string(3) "100"
  ["yingyu"]=>
  int(100)
}
<br> 90<br> 100<br> 100<br>yuwen-->90 | shuxue-->100 | yingyu-->100 | <hr/>array(2) {
  ["语文"]=>
  int(0)
  ["数学"]=>
  int(99)
}
Array
(
    [语文] => 0
    [数学] => 99
)
<h1>预定义变量</h1><h2>get请求(获取资源)</h2><h2>post请求（传递数据）</h2><a href="05demo.html">05demo</a><h2>put请求（修改数据）</h2><h2>delete请求（删除某个请求）</h2>  	
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