PHP Programming Language - Cultural View

PHP syntax and semantics 168
PHP syntax and semantics
The syntax of the PHP programming language is the set of rules that defines how a PHP program will be written
and interpreted.
Overview
PHP only parses code within its delimiters. Anything outside its delimiters is sent directly to the output and not
parsed by PHP. The most common delimiters are , respectively open and close delimiters. style delimiters are also always available, so these two forms are the most portable. The
first form of delimiters, , in XHTML and other XML documents, creates correctly formed XML
'processing instructions'. [1] Therefore, in either of these two cases, the resulting mixture of PHP and other markup is
well-formed, and so probably valid, as XML and XHTML on the server before PHP processing. This may be helpful
if the source code documents ever need to be processed in other ways during the life of the software.
Short opening tags (