I have noticed that in PHP (7.x), when you write to a file, it overwrites any existing characters. For example,
$file = fopen("test.txt", "r+");
/* test.txt contains
abc123
*/
fwrite($file, "~");
/* test.txt now contains
~bc123
*/
fclose($file);
This is a simple example - I could have stored all of the file contents, reopened in write mode, type ~, type the stored contents, done - but my file is going to become large (meaning variable size), and it contains multiple records, not just one like this example.
What I want is something like this:
$file = fopen("test.txt", "ir+"); // insert mode r+
/* test.txt contains
abc123
*/
fwrite($file, "~");
/* test.txt now contains
~abc123
*/
fclose($file);
Is there a way to do this?
