PHP学习笔记(1)[]

1&＃xff0c; include的时候&＃xff0c;根目录在哪里&＃xff1f;

include_once( $_SERVER["DOCUMENT_ROOT"] . "/include.php" ); //注意要大写。

2&＃xff0c; 字符串取字串用{} [] 都可以

$s &＃61; "a string";
$s[1] &＃61; "_"; // $s &＃61; "a_string"; 用$s{1}也可以

3&＃xff0c;常量用define来定义&＃xff0c; define( "HI", "Hello,world" ); print ( HI );

4,特殊的运算符&＃64;,安静的意思&＃xff0c;出了错也不理睬。 &＃64;( 10/0 )

5,&＃96;&＃96;反引号表示指向命令&＃xff0c;取回结果. print( nl2br(&＃96;ls -a&＃96;) )

6, foreach 这样用 foreach( array as key&＃61;>value ) {}

7, 求数组的长度用count, 比如 count($array);

8, 取得用户的输入用$_REQUEST[], 用GET提交的可以用$_GET[]来提取&＃xff0c;用POST提交的可以用$_POST[]来提取。

9, $_SERVER["PHP_SELF"]就是script本身

10&＃xff0c;What is COOKIEs? This is the best difine I see. "COOKIEs are small things of data created by Web Server but stored on the client."

11, 客户端发送来的COOKIEs在$_COOKIE[]中&＃xff0c;if you want to set COOKIE from server site, use setCOOKIE() function. example: setCOOKIE("TestCOOKIE", $value, time()&＃43;3600); /* expire in 1 hour */

12, File upload 用$_FILES来处理&＃xff0c;下面是一个例子&＃xff1a;

\n"); } else { //delete the file unlink($_FILES[&＃39;upload_test&＃39;][&＃39;tmp_name&＃39;]); //show information about the file print("Local File: " . $_FILES[&＃39;upload_test&＃39;][&＃39;tmp_name&＃39;] . "
\n"); print("Name: " . $_FILES[&＃39;upload_test&＃39;][&＃39;name&＃39;] . "
\n"); print("Size: " . $_FILES[&＃39;upload_test&＃39;][&＃39;size&＃39;] . "
\n"); print("Type: " . $_FILES[&＃39;upload_test&＃39;][&＃39;type&＃39;] . "
\n"); print("

---

\n"); } }?>" method&＃61;"post">

13, fopen, and fopen mode

fopen( $filename, "r" ) //readonly
"r&＃43;" - read,write

"w" - write, will overwirte the origal one, if not exist, will try create one
"w&＃43;" - write, read

"a" - append
"a&＃43;" - append and read

14, An example to show how to use session

Diagnostic Information
\n"); print("Session Name: " . session_name() . "
\n"); print("Session ID: " . session_id() . "
\n"); print("Session Module Name: " . session_module_name() . "
\n"); print("Session Save Path: " . session_save_path() . "
\n"); print("Encoded Session:" . session_encode() . "
\n"); print("

---

\n"); if(isset($_SESSION[&＃39;Name&＃39;])) { print("Hello, {$_SESSION[&＃39;Name&＃39;]}!
\n"); } print("You have viewed this page " . $_SESSION[&＃39;Count&＃39;] . " times!
\n"); //show form for getting name print("" . "
\n" . "
\n" . ""); //use a link to reload this page print("reload
\n");?>