


[ 2006/04/09 21:46 | by andyli ]
Collection, good stuff
/**********************
*
* author : Emerald
*
* homepage : http://gi.2288.org:88/
*
* sitename : Green Institute - Green Institute
*
* date : 2005-2-11 2:27:18
*
* PHP server variable: $_SERVER
*
*************** *****/
echo Related to document root.
.$_SERVER['argv'].'
' #Parameters passed to the script.
.$_SERVER['argc'].'
' #Contains the number of command line parameters passed to the program (if running in command line mode).
.$_SERVER['GATEWAY_INTERFACE'].'
' #The version of the CGI specification used by the server. For example, "CGI/1.1".
.$_SERVER['SERVER_NAME'].'
' #The name of the server host where the script is currently running.
.$_SERVER['SERVER_SOFTWARE'].'
' #The string of server identification, given in the header when responding to the request.
.$_SERVER['SERVER_PROTOCOL'].'
' #The name and version of the communication protocol when requesting the page. For example, "HTTP/1.0".
.$_SERVER['REQUEST_METHOD'].'
' #Request method when accessing the page. For example: "GET", "HEAD", "POST", "PUT".
.$_SERVER['QUERY_STRING'].'
' #Query string.
.$_SERVER['DOCUMENT_ROOT'].'
' #The document root directory where the currently running script is located. Defined in the server configuration file.
.$_SERVER['HTTP_ACCEPT'].'
' #The content of the Accept: header of the current request.
.$_SERVER['HTTP_ACCEPT_CHARSET'].'
' #The content of the Accept-Charset: header of the current request. For example: "iso-8859-1,*,utf-8".
.$_SERVER['HTTP_ACCEPT_ENCODING'].'
'#The content of the Accept-Encoding: header of the current request. For example: "gzip".
.$_SERVER['HTTP_ACCEPT_LANGUAGE'].'
'#The content of the Accept-Language: header of the current request. For example: "en".
.$_SERVER['HTTP_CONNECTION'].'
' #The content of the Connection: header of the current request. For example: "Keep-Alive".
.$_SERVER['HTTP_HOST'].'
' #The content of the Host: header of the current request.
.$_SERVER['HTTP_REFERER'].'
' #The URL address of the previous page linked to the current page.
.$_SERVER['HTTP_USER_AGENT'].'
' #The content of the User_Agent: header of the current request.
.$_SERVER['REMOTE_ADDR'].'
' #The IP address of the user who is browsing the current page.
.$_SERVER['REMOTE_HOST'].'
' #The host name of the user who is browsing the current page.
.$_SERVER['REMOTE_PORT'].'
' #The port used by users to connect to the server.
.$_SERVER['SCRIPT_FILENAME'].'
' #The absolute path name of the currently executing script.
.$_SERVER['SERVER_ADMIN'].'
' #Administrator information
.$_SERVER['SERVER_PORT'].'
' #The port used by the server
.$_SERVER['SERVER_SIGNATURE'].'
' # A string containing the server version and virtual hostname.
.$_SERVER['PATH_TRANSLATED'].'
' #The base path of the file system (not the document root directory) where the current script is located.
.$_SERVER['SCRIPT_NAME'].'
' #Contains the path of the current script. This is useful when the page needs to point to itself.
.$_SERVER['REQUEST_URI'].'
' #The URI required to access this page. For example, "/index.html".
.$_SERVER['PHP_AUTH_USER'].'
'
#When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the username entered by the user.
.$_SERVER['PHP_AUTH_PW'].'
'
#When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
.$_SERVER['AUTH_TYPE'].'
'
#When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the authentication type.
$_SERVER['PHP_SELF'].'
' #The file name of the currently executing script, related to document root.
?>
The above introduces the 500 internal server error server variable compiled by others: $_SERVER, including the content of 500 internal server error. I hope it will be helpful to friends who are interested in PHP tutorials.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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