Examples of the essence and techniques in PHP language (1)_PHP Tutorial

Many PHP programmers, especially those who have not studied for a long time, do not know the essence of PHP. How did Perl become famous in the business world? Its powerful regular expressions. What about PHP? It is a language developed under Unix. Of course, it inherits many features of Perl and has the advantages of C. It is fast, concise and clear, especially for C programmers. PHP is their favorite. I just love "PHP" deeply (I have even forgotten my girlfriend). Here, I want to write about PHP variables and array application skills, PHP regular expressions, and PHP template applications. I will write about the complete combination of PHP and COM, and PHP and XML when I have time in the future.

1. Application skills of variables and arrays

(1) Array functions that are rarely used by many people. foreach, list, each. Just give a few examples and you should be able to figure it out. 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) Variables of functions, variables of variables, “pointers” of variables:

    //变量的变量 $var = "this is a var";$varname = "var";echo $$varname;//函数的变量function fun1($str) {echo $str;}$funname = "fun1";$funname("This is a function !");?>

“pointers” of variables. This pointer is enclosed in double quotes, indicating that it is not a real pointer. Take a look at the following example:

    function($a) { $a ++;}$c = 0;function($c);echo $c; //$c仍为0function(&$a) {$a ++;}$c = 0;echo $c; //$c为1?>

The reason why it is called a "pointer" is because it has the same function as a pointer in C language. But this is not a real pointer, it can only be understood in this way. 1

http://www.bkjia.com/PHPjc/446685.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446685.htmlTechArticleMany PHP programmers, especially those who have not studied for a long time, do not know the essence of PHP. How did Perl become famous in the business world? Its powerful regular expressions. And what about PHP? He is a programmer from...