PHP Learning Notes-1

PHP Basic Syntax

PHP scripts can be placed anywhere in the document;

PHP script to <? php to start with ? > end;

PHP files usually include HTML tags and some php script code;

Give me a chestnut:

1 2 3 4 5 6 7 <?  8echo "Hello world!"  9 
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It is important to note that every sentence in PHP is  ended. ; is a delimiter used to separate the instruction set. Echo and print are the basic instructions for outputting text in the browser. 
PHP Variable rules:

 
 

  
  
 
   
The variable starts with the $ sign, followed by the name of the variable
 
   
Variable names must start with a letter or underscore character
 
   
Variable names can contain only alphanumeric characters and underscores (A-Z, 0-9, and _)
 
   
Variable names cannot contain spaces
 
   
Variable names are case-sensitive ($y and $Y are two different variables)
 
  
 
 
Both the PHP statement and the PHP variable are case-sensitive.
PHP Learning Notes-1