A tutorial network PHP introductory tutorial 03:php syntax structure

I. PHP syntax structure

PHP's syntax structure is divided into four styles: Standard style, short style, ASP style, long style.

1. Standard style

This is the most used of a style;

The writing format is:

<?php Code snippet; ?>

Note: The PHP end of each sentence with a semicolon!

Example:

<?php echo ' Hello World ' ?>

Build Method: Here to the standard style as an example to illustrate, after writing code, see the effect of the method, the following styles also apply.

The first step: Open the Phpstudy folder → Open the www folder → create a new folder, named Demo!

Step Two: Run Zend Studio, right click in the left margin, select "new" → "Project";

Step three: Click Local PHP Project to create a new file

The fourth step: in the shot out of the box, input and small part of the same thing, the file name is named "Day1", save the directory for the previous set up a good "Demo", the last click Finish;

Fifth Step: Enter the above for everyone to write good example code, ctrl+s save the file;

Sixth step: Open the browser, in the browser input "localhost", if the display and the following picture is not the same, then look at the seventh step, if the same click "Demo" → "Day1" to see the code generation effect.

Seventh step: In Phpstudy, click on the other Options menu →phpstudy settings → allow directory listing, and finally back to the browser refresh will become the same as the sixth step.

2. Short style

Writing format:

? Code snippet; ?>

Note: you need to Short_open_tag = on in the PHP configuration file, restart the server to take effect;

Detailed steps:

The first step: Open Phpstudy, click "Other Options Menu" → "Open configuration file" → "Php-ini", as shown in the following figure;

The second step: Press the shortcut key "Ctrl+f", Input: Short_open_tag, click Down Search, find the location of the following figure, the "off" to "on", if it is on, then do not move it.

The third step: click on the phpstudy on the restart can be.

Example:

? Echo ' Welcome to Cloud Community Network ' ?>

3, ASP style

The writing format is:

<% Code snippet; %>

Note: Need PHP configuration file Asp_tags = On, restart the server in effect, this everyone reference short style can;

Example:

<% Acho ' Welcome to cloud-dwelling community network ' %>

4, long style

Writing format:

Example:

Second, PHP comments

PHP annotations are divided into single-line comments and multiline annotations;

Reasons to write comments: to be able to work with colleagues or small partners, others or themselves can clearly understand the role of the Code.

1. Single note

Use '//' to annotate, as shown below;

<?php //This is our single-line comment. Echo ' Welcome to Cloud Community Network ' ?>

2, Multiline comments

Use/**/to annotate, as follows:

<?php /* * This is our multiline comment. * */ Echo ' Welcome to Cloud Community Network ' ?>

Three, PHP file naming Considerations

1. Start with letters or underscores, followed by numbers, letters and underscores;

2, the name should have the meaning, a see the file name to know inside content;

3, do not include special characters;

4, do not have Chinese;

The above is this time for everyone to bring the grammar structure of the entire content of PHP, I hope you can have a harvest after reading.