PHP Static class instance code

In PHP, using the keyword static modifier member properties and member methods are called static properties and static methods. static properties and static methods do not need to be used directly in cases where the class is instantiated.

Static properties

Unlike normal member properties, a static property belongs to the class itself and not to any instance of the class. Static properties can be seen as global variables stored in classes that can be accessed from anywhere through classes.

Because static properties are not constrained by any specific object, you do not need to establish a class instance, but you can directly reference a static property in the class, using the syntax format as follows:

Class Name:: $ static property name

Where the symbol "::" is called the scope-resolution operator, which can be used to access static members, static methods and constants, and to override members and methods in a class.

If you want to access a static property in a member method of the same class, you can do so by adding the operator "Self::" Before the name of the static property.

Here is the PHP sample code

<?php class Shtml {var $Templet;    var $DataSource;    var $Dir;    var $fileName;    var $mod;    var $handle;    function Shtml ($fileName = "") {$this->filename= $fileName;    $this->mod= "WB";    $this->handle=false;    $this->templet = "";    $this->datasource = Array ();    $this->dir = "";    }///< Description >//Bind data source, parameter is an array.    </Description > Function binddata ($arr) {$this->datasource = $arr;    }///< Description >//Set file storage path.    </Description > Function Setdir ($dir) {$this->dir = $dir;    } function Setfilename ($fileName) {return $this->filename= $fileName;    } function Getmod () {return $this->mod;    } function Setmod ($mod) {return $this->mod= $mod; } function Open () {if (substr ($this->filename,0,1) = = "/") $this->filename = $_server[' Document_root ']. $    this->filename; if ($this->handle=fopen ($this->filename, $this->mod)) return $this->handle;    else return false;    } function Close () {return fclose ($this->handle);    } function Write ($content) {return fwrite ($this->handle, $content);    } function MkDir ($pathname) {$currentPath = "";    Str_replace ("\", "/", $pathname);    $PATHARR = Split ("/", $pathname);    if ($pathArr [0] = = "")//Use absolute path {$currentPath = $_server[' Document_root '];    } else {$currentPath = $_server[' Document_root '). DirName ($_server[' php_self ']);    } for ($i =0; $i <count ($PATHARR); $i + +) {if ($pathArr [$i]== "") continue; else if (Is_dir ($currentPath. "/" . $PATHARR [$i]) $currentPath = $currentPath. "/" .    $PATHARR [$i]; else mkdir ($currentPath = $currentPath. "/" .    $PATHARR [$i]);    }}///< Description >//Generate static files.    </Description > Function Create () {$tmp = $this->templet; foreach ($this->datasource as $key = = $value) {$tmp = Str_replace ("<field_". $key. ">", $value, $tMP);    } $this->mkdir (dirname ($this->filename));    $this->open ();    $this->write ($tmp);    $this->close ();    }} function createshtml () {Ob_start ("callback_cteateshtml");    } function callback_cteateshtml ($buffer) {$page = intval (@$_request["page"]);    $shtml = new shtml (); $shtml->setfilename ($_server[' document_root '). DirName ($_server[' php_self ']). "/" . basename ($_server[' php_self '], ". PHP"). ($page ==0? "" : "_" . Strval ($page)).    ". htm");    $shtml->templet = $buffer;    $shtml->create ();    return $buffer; }?>