PHP Lesson 1: Understanding PHP

PHP Lesson 1: Understanding PHP

Target Planning:
Through the first lesson, we can understand the php environment.

1. Environment Awareness:
2. access method:
3. Modify and view the code.
4. Use of Variables
5. Code indentation must have a hierarchical relationship, and it is best to keep blank lines between codes.
6. variable naming:
7. Output of variables:
8. Three Methods of variables:

1. Environment Awareness:

Software: http://download.csdn.net/detail/junzaivip/7697331

The installation tutorial is very simple. You can click here on your own

Directory structure after installation:

<喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + signature + 1rG909Ta5K/Signature/ybfDzso8L3A + signature/tC48L3A + CjxwPs7Sw8e/Signature + signature + sLro7o8L3A + Signature = "brush: java;">

 ";echo "Hello world";echo "/html";?>

Recommended syntax

4. Use of Variables

5. Code indentation must have a hierarchical relationship, and it is best to keep blank lines between codes.

6. variable naming:
. Try not to use Chinese Characters
. Try not to start with a number
. Try not to use meaningless letters
. Variable names are case-sensitive. function names are case-insensitive and class names cannot be case-sensitive.
6. 5. The variable definition must be added with $

7. Output of variables:
Echo $ name;


8. Three Methods of variables:
Echo ($ name); // output variable
Var_dump ($ name); // output array, and print type and length
Print_r ($ name); // output Array


Example:

Shown below

Through the above display, we can see that the display is very unattractive and does not need to be read, so the formatting output scheme is as follows:

 "; Print_r ($ arr); echo"

";?>

The result is as follows:

TIPS:

Utf-8 encoding, a Chinese character is 3 Characters

Gbk encoding, a Chinese character is 2 Characters