<?php
$keystr = $argv[1];
echo "\n\nplain String:\n$keystr \n\nsha256 hash:\n". hash('sha256', $keystr ) ."\n\n" ;
?>
php sha256enc.php teststring
###output
plain String:
teststring
sha256 hash:
3c8727e019a42b444667a587b6001251becadabbb36bfed8087a92c18882d111