PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Embedding PHP in HTML
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XML style
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This is the tag style that we use in this book; it is the preferred PHP tag style.The
server administrator cannot turn it off, so you can guarantee it will be available on
all servers, which is especially important if you are writing applications that may be
used on different installations.This tag style can be used with Extensible Markup
Language (XML) documents. In general, we recommend you use this tag style.
Short style
This tag style is the simplest and follows the style of a Standard Generalized
Markup Language (SGML) processing instruction.To use this type of tag—which
is the shortest to type—you either need to enable the short_open_tag setting in
your config file or compile PHP with short tags enabled.You can find more information
on how to use this tag style in Appendix A.The use of this style is not recommended
because it will not work in many environments as it is no longer
enabled by default.
SCRIPT style
echo ‘Order processed.’;
This tag style is the longest and will be familiar if you’ve used JavaScript or
VBScript.You might use it if you’re using an HTML editor that gives you problems
with the other tag styles.
ASP style
This tag style is the same as used in Active Server Pages (ASP) or ASP.NET.You
can use it if you have enabled the asp_tags configuration setting.You probably
have no reason to use this style of tag unless you are using an editor that is geared
toward ASP or ASP.NET. Note that, by default, this tag style is disabled.
PHP Statements
You tell the PHP interpreter what to do by including PHP statements between your
opening and closing tags.The preceding example used only one type of statement:
echo ‘Order processed.’;
As you have probably guessed, using the echo construct has a very simple result: It
prints (or echoes) the string passed to it to the browser. In Figure 1.2, you can see the
result is that the text Order processed. appears in the browser window.