PHP first lesson simple to understand PHP

Goal Planning:
Through the first lesson, we can learn about the PHP environment.

1. Understanding of the environment:
2. Access method:
3. Modify the code and view.
4. Use of variables
5. Code indentation to have a hierarchical relationship, and the best between the code to keep blank lines
6. Variable Name:
7. Output of variable:
8. Three methods of variable:

1. Understanding of the environment:

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

Installation tutorial is very simple, you can own Baidu

Directory structure after installation:

<喎?http: www.2cto.com="" kf="" ware="" vc="" "="" target="_blank" class="keylink"> vcd4kpha+pc9wpgo8cd4ylrfdzsq3vbeoojwvcd4kpha+1rg909ta5k/awmb3yuti6zpsb2nhbghvc3qgvls/ybfdzso8l3a+ cjxwpjwvcd4kpha+my7q3rjetprc67ywsum/tc48l3a+cjxwps7sw8e/ydlu0n64xmnpw+bev8k8d3d31tc1xgluzgv4lnbocdwvcd4kpha+ Cghwyusz9mh0bwy0+slro7o8l3a+cjxwpjwvcd4kphbyzsbjbgfzcz0= "Brush:java;" >

 
  ";
echo "Hello World";
echo "/html";

? >

Suggested wording

4. Use of variables

5. Code indentation to have a hierarchical relationship, and the best between the code to keep blank lines

6. Variable Name:
6.1. Try not to use Chinese
6.2. Try not to start with numbers
6.3. Try not to use meaningless letters
6.4. Variable names are case-sensitive, function names are case-insensitive, class names are not case-sensitive, and simply variable names and functions are all lowercase.
6.5. Definition of variable must be added $

7. Output of variable:
Echo $name;


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


Example

Shows the following

Through the above display, we can see that the display is very beautiful, and do not read, so format the output scheme:

 
  ";
	Print_r ($arr);
	echo "

";?>

The results appear as follows:

Small knowledge:

Utf-8 encoding, a Chinese text is 3 characters

GBK encoding, one Chinese is 2 characters