1. The concept of buffer:
The buffer is actually a buffer, a memory address space, the main user storage data area.
A process of outputting statements in php is: content --php buffer --- tcp --- terminal
Open the buffer in php: enter php.ini file and open "output_buffering = on"
Example: (Get the data in the buffer)
<?php
echo 'Get buffer data;
// Get the data of the buffer through the following function
echo ob_get_contents();
?>
2. How does PHP achieve page static method :
The first kind: through the file_get_contents () function
file_get_contents (): Write a string to a file.
file_get_contents ('index.shtml', 'String data');
The second kind: use PHP built-in caching mechanism to achieve page static: output_buffering
Several commonly used functions:
ob_start: open the output control buffer (when output_buffering in the php.ini file is closed, you can directly use this function to start)
ob_get_contents: return the contents of the output buffer
ob_clean: clear the contents of the output buffer
ob_get_clean: get the contents of the current buffer and delete the current output buffer
3. Steps to achieve a purely static case:
One of the main practical steps is to obtain data from the database-and then fill the obtained data into the template (php dynamic page)-and then convert the dynamic page into a static page to generate a pure static file.
case study:
<?php
dataarray: data found in the database (in the form of an array)
ob_start (); // Start buffer
// Fill the data obtained from the database into the template file-and then introduce the template file into the current page to execute
require_once('/index.php');
if(file_put_contents('index.shtml', ob_get_clean()))
{
echo 'success';
}else
echo 'error';
?>
The above program will generate a purely static page: index.shtml
4. How to trigger the system to generate a purely static page:
Three ways:
First: add cache time to the page
if (is_file ("./ index.shtml") && (time ()-filemtime ("./ index.shtml")) <500) {require_once ("./ index.shtml") // less than 5 minutes Load the generated static file} else {// Ask a dynamic template file to regenerate a static file}
Second: manual trigger mode
Third: crontab regular scan program (timed update program in linux system)
crontab regular scanning program (a scanning tool under linux):
Example: * / 5 **** php /data/static/index.php
* / 5 **** php: Use asterisks to represent five time zones: the first star represents minutes, and the subsequent stars represent time, day, month, and week in sequence. Obviously, it now means that every 5 minutes is executed under the following path. PHP program.
How to set the above command under Linux?
First switch to root and enter crontab -e to edit and write * / 5 **** php /data/static/index.php
Then use the tail -f /var/log/cron.log command to view a log of the program execution (view the execution process)
5. Partial dynamic case realization:
Use ajax technology to achieve:
$.ajax({
'url': 'Dynamic path',
'type': 'get / post', // transmission method
'dataType': 'json', // Data type returned
’error‘ : function(){},
'success' : function(result)
{
html = ’‘;
// Use each function to traverse
$.each(result.data, fuction(key,value)
{
html + = .......... Here, for example, loop a li
// Then find or set the ID value to be put in a certain area
$("#a") . html(html);
});
}
})
6. PHP processing pseudo-static:
Probability: Convert dynamic URLs into static URLs (the essence is still a dynamic address)
Function: beautiful, conducive to collecting data, etc.
There are two processing methods:
The first one: match by regular
First print the global variable $ _SERVER in php and you will see a PATH_INFO, which is the address behind the domain name and then use regular to match
preg_math ("Regular Rules", $ _SERVER ['PATH_INFO']);
