An example of setting ACL controls using Parse PHP SDK

parse_acl.php

$parse = new parseObject('BlogPost');
$parse->title = "My first blog post";
$parse->story = "Welcome to my site. This is my first...";

$acl = new parseACL();
// Give the user Write access to object
$acl->setWriteAccessForId( $user_id, true );
// Give public read access
$acl->setPublicReadAccess( true );
// Disable write access for public
$acl->setPublicWriteAccess( false );
$parse->ACL = $acl->acl;

$result = $parse->save();