PHP fwrite() and fputs() functions are used to write data into file. To write data into file, you need to use w, r+, w+, x, x+, c or c+ mode.
The PHP fwrite() function is used to write content of the string into file.
int fwrite ( resource $handle , string $string [, int $length ] )
If you run the above code again, it will erase the previous data of the file and writes the new data. Let's see the code that writes only new data into data.txt file.
If you use a mode, it will not erase the data of the file. It will write the data at the end of the file. Visit the next page to see the example of appending data into file.Click me for more details...