Systematic summary of the essence and skills in PHP development language_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');

      $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

　　";

　　}

while(list($subscript, $value) = each($data))

　{

      //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 !");

　　?>

echo "$subscript => $value :: ";

     function($a) {

　　$a ++;

　　}

　　$c = 0;

　　function($c);

　　echo $c; //$c仍为0

　　function(&$a) {

　　$a ++;

　　}

　　$c = 0;

　　echo $c; //$c为1

　　?>

echo "$subscript => $valuen

• 　";
• 　}
• reset($data);
• foreach($data as $subscript => $value)
• 　{

echo "$subscript => $value :: ";

echo "$subscript => $valuen

　"; 　}

(2) Function variables, variables of variables, and "pointers" of variables:

//Variable variables 　$var = "this is a var"; 　$varname = "var"; echo $$varname; //Function variables 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) { 　$a ++; 　} 　$c = 0; Function($c); echo $c; //$c is still 0 Function(&$a) { 　$a ++; 　} 　$c = 0; echo $c; //$c is 1 　?>

The reason why it is called a "pointer" is 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. Total 2 pages: Previous page12Next page http://www.bkjia.com/PHPjc/364182.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/364182.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...