PHP Learning Notes (i): basic grammar markers, blanks, and annotations, learning Notes basic Grammar _php tutorial

PHP Learning Notes (i): basic grammar markers, blanks, and annotations, learning the basic grammar of notes

First, PHP tags

1. XML style
Copy the Code code as follows:
<?php echo "Hello World";? >

2. Short style
Copy the Code code as follows:
<? echo "Hello World";?>

3. Script Style
Copy the Code code as follows:

Second, PHP comments

1. Single-line Comment://(C + + style)
2. Multiline Comment:/* */(c-style)
3. Single-line script Comment: # (shell style)

Tips: Notes are generally written on the code

Third, PHP blank

1. Blank Spacer

Line break (carriage return), Space, tab (tab)

2. Conventions and customs

Code snippet (2 lines), Class (2 rows), function (1 rows), function variable and first statement (1 lines), before comment (1 lines)

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