PHP-Related understanding

1:php (Html,css,js,flash,,,) its different codes are executed in different places (client, server)!
2:php code (script), except that the PHP script executes on the server, the other code is executed on the client!
For example, when the Internet, will remind security, allow scripts or something, that is JS in play!
Features of 3:apach: 1. Web server (accept a page and return this page) 2: Combined with PHP
4:web Server (accepts a page and then returns the page) application server (direct execution of a technology (PHP,HTML,JS,CSS,,,))

PHP-Related understanding