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int file_put_contents ( string $filename , mixed $data [, int $flags = 0 [, resource $context ]] )

<?php
echo file_put_contents("sites.txt","tutorialpro");
?>

6

<?php
$file = 'sites.txt';

$site = "\nGoogle";
// Append content to the file
// Use FILE_APPEND flag to append content at the end of the file
// LOCK_EX flag prevents simultaneous writing
file_put_contents($file, $site, FILE_APPEND | LOCK_EX);
?>

tutorialpro
Google