A php-generated html class program_PHP tutorial
This is implemented directly using the constructor. Considering that there will be a lot of processes that generate static pages, it is better to change it to a function call. This is reserved for future use. In the class, replace template() with templateHtml() to achieve it. ,
This is implemented directly using the constructor. Considering that there will be many processes that generate static pages, it is better to change it to a function call. It is reserved here for backup. Just replace template() in the class with templatehtml(). Realize,
*/
class template
function template()
{
var $temp; //The read template page file name (including path)
var $html; //The name of the html file to be generated (including path)
var $err; var $test; //Data flow
var $arr; having having to replace the array pattern (key name->template label, key value->replacement content)
{
if((int)$err==0)
$this->temp=""; $this->temp="";
}
function templatehtml($temp,$html,$arr)
{
$err=$this->chkfile($temp);{
$test=fread($fp,filesize($temp)); //Read the data stream of the template page
}
echo "Generated from template page ".$temp." ".$html.$this->error($err);
Return;
}
/*
*Check whether the file exists
*Return error message
*/function chkfile($file)
}
{
if (file_exists($file))
{
Return 0;
}
return 1;
}
/*
*According to the content of the array file, replace the data flow pattern (key name->template label, key value->replacement content)
*Return data stream
*Parameter $arr: array
*Parameter $test: data stream
*/
Function arr_replace($arr,$test)
{
$ss=$test;
foreach ($arr as $key => $value)
{
$ss= str_replace($key,$value,$ss);
}
Return $ss;
}
/*
*Write data stream to file
*Return to execution status
*Parameter $html: html file to be generated
*Parameter $test: data stream
*/
Function writefile($html,$test)
{
$stat=2;
If($this->chkfile($html)==0) //Determine whether the file exists
{
$stat=0; //Already exists and returns 0
}
If($f=fopen($html,"w")) //Open the file in writing mode, create it if it does not exist
{
fputs($f,$test);
fclose($f);
}
else
{
$stat=2; //Write failure returns 2
}
Return $stat;
}
/*
*Error message
*Return error message
*Parameter $err: error number
*Parameter $file: error file
*/
function error($err)
{
$message="";
switch((int)$err)
{
case 0 :
$message="Static page generated successfully";
break;
case 1 :
$message=" The template page failed to open, please check whether it exists";
break;
case 2 :
$message="File generation failed, please check directory permissions";
break;
default:
$message="Unknown error";
}
return $message;
}
/*
*
*Mainly used to read template pages and return data streams (such as top, foot public files,)
*Parameter $file: template page path
*/
function readhtml($file)
{
$test="";
$err=$this->chkfile($file);
if($err==0)
{
$fp=fopen($file,"r"); //Open the template page in read-only mode
$test=fread($fp,filesize($file)); //Read the data stream of the template page
}
else
{
$test=$file.$this->error($err);
}
Return $test;
/*
*
*Mainly used to delete generated files without returning
*Parameter $file: file path
*/function delete_file($file)
{
if (file_exists($file))
{
$delete = chmod ($file, 0777);
$delete = unlink($file);
if(file_exists($file))
{
$filesys = eregi_replace("/","",$file);
$delete = system("del $filesys");
clearstatcache();
if(file_exists($file))
{
$delete = chmod ($file, 0777);
$delete = unlink($file);
$delete = system("del $filesys");
}
}
clearstatcache();
}
}
}/*
调用方法demo.html的代码
{title}
{text}
$sc=new template();
//$sc=new template($tmp,$filename,$arr); ()$tmp="../template/temp.php教程"; //模板页
$filename="test.html"; //生成页
$foot="../foot.html"; //包含的底文件,头文件同理$arr=array();
$arr["{title}"]="新标题";
$arr["{text}"]="新内容";
$arr["{foot}"]=$sc->readhtml($foot);
$sc->templatehtml($tmp,$filename,$arr);

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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