About security in Flash/php/mysql integration

O wise ones,

I was reading Ben Smiths excellent tutorial about integrating flash/mysql/php. But with all the Flash decompilers around, is it a real security risk to put a reference to a .php script in an ActionScript?

In other words, would decompiling an .swf file disclose the username/passwd combo connection to a database? Or is the file as safe as any other .php script?

Thanks in advance!