writing data fron Asterisk to a file using php

<?php
$file="/etc/asterisk/data.txt";
$data=$argv[1]."\n";
$data.="$argv[2]";
file_put_contents("$file", $data,FILE_APPEND);
?>


exten=>_1011,1,Noop()
same=>n,system(php /root/script_write.php ${CHANNEL} ${UNIQUEID})