PHP syntax structure

PHP Document composition

Html/xhtml Mark

CSS Styles

Client-side scripting (such as JavaScript, jquery, etc.)

Server script: <?php echo date (' y-m-d ')?>

A PHP file must contain server scripts, but not necessarily other types of code.

PHP syntax

When parsing a file, the PHP engine looks for the fact and end tag, which tells the PHP engine to start and improve the code between the two. This parsing allows PHP to be embedded in a variety of different documents, and any outside of the start and end tags will be ignored by the PHP parser.

XML style

<?phpheader ("Content-type:text/html;charset=utf-8"); echo "Hi PHP, I can conquer you!";? >

If no other content exists after the PHP code, then the end tag can be omitted and the omission is advocated.

<?phpheader ("Content-type:text/html;charset=utf-8"); echo "Hi PHP, I can conquer you!"; /script ends with no PHP end tag

Short style

<?header ("Content-type:text/html;charset=utf-8"); echo "I am short style";

Only the Short_open_tag configuration command in the PHP configuration file is activated to use the short style

ASP style

<%header ("Content-type:text/html;charset=utf-8"); echo "I am ASP Style";%>

Only the Asp_tags configuration command in the PHP configuration file is activated to use ASP style

Scripting style

<script language= "PHP" >header ("Content-type:text/html;charset=utf-8"); echo "I am Script style"; </script >

Comments

PHP supports C, C + +, and Unix shell style (Perl style) annotations.

The comment types for PHP are:

-Single line Comment

That only one line of code can be commented at a time

-Multi-line Comment

That is, you can annotate multiple lines of code at a time

Single-line Comment

C + + style annotations

Comment Content

Shell style annotations

#注释内容

Multi-line comments

<?php/*............*/

Note: When using multi-line annotations, you cannot let annotations fall into a recursive loop

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PHP syntax structure