int file_put_contents ( string filename , mixeddata [, int flags = 0 [, resourcecontext ]] )

<?php
   echo file_put_contents("PhpProject/sample.txt" ,"Hello World!");
?>

11

<?php
   file = "/PhpProject1/sample.txt";
   // The new person to add to the filetest = " Tutorialspoint";
   // using the FILE_APPEND flag to append the content to the end of the file
   // and the LOCK_EX flag to prevent anyone else writing to the file at the same time
   file_put_contents(file,test, FILE_APPEND | LOCK_EX);
   echo "Content has been loaded successfully";
?>

Content has been loaded successfully