PHP basic functions

The content introduced in this article is about the basic functions of PHP. Now I share it with you. Friends in need can refer to it

Variable scope

Local variables

Super global variables

$_SERVER $GLOBALS $_GET $_POST $_REQUEST $_COOKIE $_SESSION

Global variables

Local static variables

Use global variables inside the function

 $a = 4;
    function add(){
        global $a;
        $a++;
        echo $a;
    }
    add();
    echo "<br/>";
    echo $a;

php functions related to functions

function_exists();
func_get_arg();
func_get_args();
func_num_args();

Commonly used functions in the system

Time

Mathematics

String

Print

Array

count()

Related recommendations:

Detailed explanation of PHP basic knowledge

Summary of PHP basic syntax

php basic knowledge note sharing

The above is the detailed content of PHP basic functions. For more information, please follow other related articles on the PHP Chinese website!