PHP 学习 第一天

  1 <?php
  2  //phpinfo();
  3  $myarray = array("1","2","3","4");
  4  for($i = 0; $i<count($myarray);$i++){
  5     echo $myarray[$i] . "<br>";
  6 }
  7 ?>
  8 <hr>
  9 <?php 
 10 $myarray= array('aaa'=>'111','bbb'=>'222');
 11 echo $myarray['aaa'];
 12 ?>
 13 <hr>
 14 <?php 
 15 $aa=11;
 16 $bb="22";
 17 $aa += (int)$bb;
 18 echo $aa;
 19 ?>
 20 <hr>
 21 <?php 
 22 $aa="1234567890";
 23 echo substr($aa,0,5) . "<br />";
 24 echo is_string($aa) . "<br />";
 25 echo is_int($aa). "<br />";
 26 ?>
 27 <hr>
 28 <?php 
 29 echo $_SERVER["PHP_SELF"]. "<br />";
 30 echo $_SERVER["SERVER_PORT"]. "<br />";
 31 
 32 
 33 echo $_SERVER["HTTP_REFERER"]. "<br />";//=http://localhost/lianxi/
 34 echo $_SERVER["HTTP_ACCEPT_LANGUAGE"]. "<br />";//=zh-cn
 35 echo $_SERVER["HTTP_ACCEPT_ENCODING"]. "<br />";//=gzip, deflate
 36 echo $_SERVER["HTTP_USER_AGENT"]. "<br />";//=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
 37 echo $_SERVER["HTTP_HOST"]. "<br />";//=localhost
 38 echo $_SERVER["HTTP_CONNECTION"]. "<br />";//=Keep-Alive
 39 echo $_SERVER["PATH"]. "<br />";//=C:WINDOWSsystem32;C:WINDOWS;C:WINDOWSSystem32Wbem;C:Program FilesCommon FilesAdobeAGL;C:Program FilesMySQLMySQL Server 5.0bin;C:php;C:phpext
 40 echo $_SERVER["SystemRoot"]. "<br />";//=C:WINDOWS
 41 echo $_SERVER["COMSPEC"]. "<br />";//=C:WINDOWSsystem32cmd.exe
 42 echo $_SERVER["PATHEXT"]. "<br />";//=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
 43 echo $_SERVER["WINDIR"]. "<br />";//=C:WINDOWS
 44 echo $_SERVER["SERVER_SIGNATURE"]. "<br />";//=
 45 
 46 echo $_SERVER["SERVER_SOFTWARE"]. "<br />";//=Apache/2.0.55 (Win32) PHP/5.1.1
 47 echo $_SERVER["SERVER_NAME"]. "<br />";//=localhost 服务器名称
 48 echo $_SERVER["SERVER_ADDR"]. "<br />";//=127.0.0.1
 49 echo $_SERVER["SERVER_PORT"]. "<br />";//=80 服务器端口
 50 echo $_SERVER["REMOTE_ADDR"]. "<br />";//=127.0.0.1
 51 echo $_SERVER["DOCUMENT_ROOT"]. "<br />";//=D:/lianxi 网站的主目录
 52 echo $_SERVER["SERVER_ADMIN"]. "<br />";//[email protected] 安装APACHE时设置的邮箱
 53 echo $_SERVER["SCRIPT_FILENAME"]. "<br />";//=D:/lianxi/lianxi/servervalues.php 当前的网页的绝对路径，
 54 echo $_SERVER["REMOTE_PORT"]. "<br />";//=1076 远程端口
 55 echo $_SERVER["GATEWAY_INTERFACE"]. "<br />";//=CGI/1.1
 56 echo $_SERVER["SERVER_PROTOCOL"]. "<br />";//=HTTP/1.1
 57 echo $_SERVER["REQUEST_METHOD"]. "<br />";//=GET
 58 echo $_SERVER["QUERY_STRING"]. "<br />";//=获取？号后面的内容
 59 echo $_SERVER["REQUEST_URI"]. "<br />";//=例子：/lianxi/servervalues.php?a=1&b=2
 60 echo $_SERVER["SCRIPT_NAME"]. "<br />";//=例子：/lianxi/servervalues.php
 61 echo $_SERVER["PHP_SELF"]. "<br />";//=/lianxi/servervalues.php 返回当前网页的相对路径.
 62 echo $_SERVER["REQUEST_TIME"]. "<br />";//=1179190013 运行时间 单位为十万分之一毫秒
 63 echo $_SERVER["argv"]. "<br />";//=Array
 64 echo $_SERVER["argc"]. "<br />";//=0
 65 /*
 66 1，$_SERVER["QUERY_STRING"]
 67 说明：查询(query)的字符串
 68 2，$_SERVER["REQUEST_URI"]
 69 说明：访问此页面所需的URI
 70 3，$_SERVER["SCRIPT_NAME"]
 71 说明：包含当前脚本的路径
 72 4，$_SERVER["PHP_SELF"]
 73 说明：当前正在执行脚本的文件名
 74 实例：
 75 */
 76 
 77 echo $_SERVER["QUERY_STRING"]. "<br />";// = “”
 78 echo $_SERVER["REQUEST_URI"]. "<br />";// = “/”
 79 echo $_SERVER["SCRIPT_NAME"]. "<br />";// = “/index.php”
 80 echo $_SERVER["PHP_SELF"]. "<br />";// = “/index.php”
 81 
 82 
 83 
 84 echo $_SERVER["QUERY_STRING"]. "<br />";// = “p=222〃
 85 echo $_SERVER["REQUEST_URI"]. "<br />";// = “/?p=222〃
 86 echo $_SERVER["SCRIPT_NAME"]. "<br />";// = “/index.php”
 87 echo $_SERVER["PHP_SELF"]. "<br />";// = “/index.php”
 88 
 89 
 90 
 91 echo $_SERVER["QUERY_STRING"]. "<br />";// = “p=222&q=baidu”
 92 echo $_SERVER["REQUEST_URI"]. "<br />";// = “/index.php?p=222&q=baidu”
 93 echo $_SERVER["SCRIPT_NAME"]. "<br />";// = “/index.php”
 94 echo $_SERVER["PHP_SELF"]. "<br />";// = “/index.php”
 95 echo $_SERVER["QUERY_STRING"]. "<br />";//获取查询语句，实例中可知，获取的是?后面的值
 96 echo $_SERVER["REQUEST_URI"]. "<br />";// 获取http://www.baidu.com后面的值，包括/
 97 echo $_SERVER["SCRIPT_NAME"]. "<br />";// 获取当前脚本的路径，如：index.php
 98 echo $_SERVER["PHP_SELF"]. "<br />";// 当前正在执行脚本的文件名
 99 
100 
101 ?>