php VC9是為IIS定製的
mysqld --install mysql5.5
php heredoc 文法中，結束標記必須頂頭寫，前面不能有空格，否則會報錯
PHP 的真正威力源自於它的函數。
*file_exists(filename);判斷檔案是否存在
*move_uploaded_file（tmpname，destpath）;移動檔案到目標路徑。
*setcookie(name, value, expire, path, domain) 函數；setcookie() 函數必須位於 <html> 標籤之前。
*session_start() 函數必須位於 <html> 標籤之前
*isset($_SESSION['key'])判斷該session是否已經設定
*unset($_SESSION['key']);失效某session
*session_destroy();徹底終結session
*mail(to,subject,message,headers,parameters)發送郵件的函數，很有用。
*set_error_handler()
有兩種過濾器：Validating 和 Sanitizing
php常用變數。
$_REQUEST
$_GET
$_POST
$_FILES
$_COOKIE
$_SESSION
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