How to understand the basic syntax and directory structure of PHP
This article mainly explains "how to understand the basic grammar and directory structure of PHP". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to understand the basic grammar and directory structure of PHP".
1. Understand the directory structure of AppServ
two。 We can understand the basic grammatical structure of PHP
1 my AppServ installation directory is E disk:
① uses the command line to operate the apache server
Turn the apache server on and off:
Httpd-k restart / / restart httpd-k stop / / close httpd-k start / / enable
If you modify the port, you can modify it in the following directory:
Httpd.conf in AppServ\ Apache2.2\ conf (main configuration file)
② operates mysql database on the command line.
Opening and closing of Mysql database:
Net stop mysql / / close the database net start mysql / / Open the database
③ Mysql database server description:
1. Installation path: e:\ AppServ\ MySQL
two。 Command path: e:\ AppServ\ MySQL\ bin
3. Configuration file: e:\ AppServ\ MySQL\ my.ini
4. The directory where the database is stored: e:\ AppServ\ MySQL\ data
E:\ AppServ\ MySQL\ data\ mysql
.frm table structure
Columns_priv.MYD table data
Columns_priv.MYI index
Coordination file of ④ php
C:\ Windows\ php.ini
① php markup
Write a php program, index.php.
② Note: only php code can be written in files with the .php suffix, and php code must be unloaded between
③ writes html code in php and nests php tags in html
Untitled
④ php comments:
/ * / Multiline comments
/ / single-line comments
5. Instruction separator
Must end with; end with
⑥ .php code writing format, note indentation, {code snippet}
⑦ .php statements and functions, blank lines between functions
Braces above and below, separated by blank lines, easy to read
8. Variable
Names should be meaningful, not letters, individual numbers, or Chinese
File name and directory name should not be in Chinese
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