File handling in php allow us to make operation to write in a file .So we can write a new file or we can append text to an already existing file.For this we have fwrite() function in PHP.

Syntax is : -

fwrite(file,string,length);

parameters are:-

file - Required. it allow there is an open file we have to write to.

string - Required. It allow string to write in a opened file.

length - Optional. It allow the max limit of bytes to write in a file.

NOTE : - If there is third parameter included in the fwrite() function, then writing in a file will stop just after the given value of length parameter .

Example for writing in a file : -

<?php
   $filename = "/home/user/guest/newfile.txt";
   $file = fopen( $filename, "w" );

   if( $file == false )
   {
      echo ( "Error in opening new file" );
      exit();
   }
   fwrite( $file, "This is  a simple test\n" );
   fclose( $file );
?>