PHP new class problem analysis and solution ideas, PHP new class ideas _php tutorial

PHP new class problem analysis and solution ideas, PHP new class ideas

Let us first analyze the problem of PHP new class

index.php file

function __autoload ($_classname) {require $_classname. Class.php ';} //New class?? if (isset ($_get[' index ')) {$m =new Main ($_get[' index ');} else{$m =new Main ();} Include $m->ui ();

main.class.php file

Class main{private $index;//construct method, initialize data public function __construct ($index = ") {$this->index= $index;} UI functions include the corresponding include file Public function UI () {if ($this->index) | |! File_exists ($this->index. Inc ') {$this->index= ' start ';} Return $this->index. Inc ';} }

What is the meaning of the Scarlet letter : The constructor parameter value in the class is set to default is null (Public function __construct ($index = ")), why can not write directly $m=new Main ($_get[' Index");. If you do not want to make a red word in index, the class needs to be written. Thank you, not too understanding.

------to solve the idea----------------------

if (isset ($_get[' index '))) {$m =new Main ($_get[' index ')),//If $_get[' index ' exists then $_get[' index ' as a parameter}else{$m =new main ( ); Otherwise use default parameters}

Direct use of $_get[' index '] will likely raise NOTICE level error

Indiscriminate use of incoming data can lead to security issues

------to solve the idea----------------------

A little change, how do you look.

<?phpclass main{private $index;//constructor method, initialize data public function __construct ($index = ") {$this->index= $index? $index :''; The//ui function includes the corresponding include file Public function UI () {if (Empty ($this->index)

------to solve the idea----------------------

!file_exists ($this->index. Inc ') {  $this->index= ' start ';} return $this->index. Inc '; } }

ps:php How do I create a file?

PHP project development process, often need to automatically create some files, such as generating static HTML, generate PHP cache files, generate TXT files and so on. Here's how to create a file with a PHP program and write content to a file.

In a project, it is possible to generate files more than once, so we can define a function to call this function when we need to create a file.

Step one, define the function WriteFile, used to open a file in writing, automatically created when the file does not exist, and write the contents to the file, code is as follows.

<?phpfunction WriteFile ($fname, $str) {$fp =fopen ($fname, "w"), Fputs ($fp, $STR); fclose ($fp);}? >

Step two, the use of functions. If you create a test.txt file and write the content "ABC", the code is as follows:

<?php$filename= ' test.txt '; $str = ' abc '; WriteFile ($filename, $str);? >

With the operation of the above two steps, PHP can create the file function.

http://www.bkjia.com/PHPjc/1073121.html www.bkjia.com true http://www.bkjia.com/PHPjc/1073121.html techarticle PHP New class problem analysis and solution ideas, PHP new class of ideas for you to analyze the problem of PHP new class index.php file function __autoload ($_classname) {require $_classname. C ...

