System Summary: The Essence and tips of PHP development language _ PHP Tutorial

The system summarizes the essence and skills of PHP development language. Many PHP programmers, especially those who have not been learning for a long time, do not know the essence of PHP. How did Perl become famous in the business world? Its powerful regular expression. What about PHP? He is a PHP programmer who has been studying PHP for a long time and does not know the essence of PHP. How did Perl become famous in the business world? Its powerful regular expression. What about PHP? He is a language developed from Unix. of course, he inherits many features of Perl and has advantages in C. Fast, concise, and clear. especially for C programmers, PHP is a favorite. I love PHP very much (I forgot my girlfriend ). Here, I want to write an article about PHP variables, array application skills, PHP regular expressions, and PHP template applications. I will try again later to write the full combination of PHP, COM, PHP, and XML.

1. Application techniques of variables and arrays

(1) a lot of array functions are rarely used. Foreach, list, and each. Here are a few examples. Example:

　　

$ Data = array ('a' => 'data1', 'B' => 'data2 ', 'C' => 'data3 '); While (list ($ subscript, $ value) = each ($ data )) { Echo "$ subscript => $ value ::"; Echo "$ subscript => $ valuen "; } Reset ($ data ); Foreach ($ data as $ subscript => $ value) { Echo "$ subscript => $ value ::"; Echo "$ subscript => $ valuen "; }

(2) function variables, variable variables, and variable "pointers ":

　　

// Variable $ Var = "this is a var "; $ Varname = "var "; Echo $ varname; // Function variable Function fun1 ($ str ){ Echo $ str; } $ Funname = "fun1 "; $ Funname ("This is a function! "); ?>

The "pointer" of the variable ". This pointer is enclosed in double quotes, indicating that it is not a real pointer. Take a look at the following example:

　　

Function ($ ){ $ A ++; } $ C = 0; Function ($ c ); Echo $ c; // $ c is still 0 Function (& $ ){ $ A ++; } $ C = 0; Echo $ c; // $ c is 1 ?>

It is called "pointer" because it has the same function as the pointer in C language. But this is not a real pointer. it can only be understood in this way.

• 2 pages in total:
• Previous Page
• 1
• 2
• Next page

Bytes. How did Perl become famous in the business world? Its powerful regular expression. What about PHP? He is a slave...