PHP implements automatic update block of web pages_PHP tutorial

Can you let PHP add some content to your web page that will automatically update every once in a while to better attract visitors? Implementing this function does not require advanced programming knowledge. Please take a look at the following example:
(1) English proverb
Let us look at a simple application: let the PHP program randomly extract a row of records from the database and display On the web page, read another record every 15 minutes. Proverbs in English and Chinese are suitable content for display.
Considering that most cheap virtual hosts that host personal homepages do not support databases such as MySQL, we use text data files to store data, which is enough for websites with low traffic. Create a text file named english.dat with the following content:
A bad beginning makes a bad ending. He who hates the beginning will hate the end.
　
　A bad bush is better than the open field. Something is better than nothing.

A bad compromise is better than a good lawsuit. A bad compromise is better than a good lawsuit.
　　　　
　A bad conscience is a snake in one’s heart. A bad conscience is a snake in one’s heart.

A bad custom is like a good cake, better broken than kept. A bad custom is like a good cake, better broken than kept.

A bad padlock invites a picklock.
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Note that each line is a complete record, do not break lines in the middle; there cannot be half-width double quotes ( " ) in the file, otherwise the program will parse errors when outputting data. There are many such contents on the Internet, Just search it, or you can go to my website http://www.musicfly.net/english.dat to download a data file.
The following is to write a program to read the data and name it english. .php, add the source code as follows:
＜?php
$filename = 'english.dat'; //Data file name
$refresh = 900; //Update cycle (in seconds, can Adjust as needed)
$data = file($filename); //Load the data file into an array
$num_lines = count($data); //The number of lines in the data file, that is, the number of records mt_srand(floor(time() / $refresh));
$id = mt_rand(0, $num_lines - 1); //Randomly select a record number
$content = chop($data[$id] ); //Select the corresponding data according to the record number, and truncate the last newline character
echo "document.write("$content");"; //Output the data in javascript form
?＞
Save english.dat and english.php and upload them to the same directory on the server.
The last step is to let your web page call this php program to display the content, because the result of php operation is output in the form of javascript. Yes, we just need to call this php as a javascrupt. The method is: use notepad or web editing software to open the html file you want to modify, and add the following code where you want the dynamic content to be displayed:

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