Combination of File Read and Write Operations in PHP
Reading and writing files can be combined. For example, let's read a file, add an exclamation mark to the end of its text, and write the text back to this file:
php$text = file_get_contents('test.txt');
file_put_contents('test.txt', $text . '!');
Suppose you have a file with a certain number written in it. Open this file, square the number, and write it back to the file.
Suppose there is a file count.txt in the root of your site.
Initially, it contains the number 0.
Make it so that when the page is refreshed,
our script increases this number
by 1 each time. That is, we will get a page refresh counter
in the form of a file.
Suppose there are files 1.txt,
2.txt, and 3.txt in the root of your site. Manually create
an array with the names of these files. Iterate through
it with a loop, read the contents of each
file, merge it into one string, and write it
into a new file new.txt. This file should not exist initially.