PHP fwrite() and fputs() functions are used to write data into file. To write data into a 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.
fwrite(file,string,length)
<?php
$fp = fopen("dataFile.txt", "w");//opens file in write-only mode
fwrite($fp, "welcome");
fwrite($fp, "to php file write");
fclose($fp);
echo "File written successfully";
?> Output: dataFile.txt
welcome to php file write
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.
<?php
$fp = fopen("dataFile.txt", "w");//opens file in write-only mode
fwrite($fp, "hello");
fclose($fp);
echo "File written successfully";
?> Output: dataFile.txt
hello
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.
