NieNet

PHP中类的继承

class appController extends coreController
{
	function __construct()
	{
		// 载入默认的父类的构造函数
		parent::__construct();
	}

	// login check or something
	
	
}

',

PHP的短标签语法

在模板中提倡使用php的短标签，而切忌使用大括号{}。if，foreach都可以这样写。

foreach的写法： 

<?php foreach( $sql as $head => $book ): ?>
	<h2><?=$head ?></h2>
	<div><?=$book ?></div>
<?php endforeach; ?>

if的写法： 

<?php if($id == 0): ?>add<?php else: ?>mod&id=<?=$id ?><?php endif; ?>

PHP与正则表达式

modifier i s m

One handy modifier is i, which makes the pattern matching case-insensitive. For example, the patterns (with delimiters) /[a-zA-Z]+/ and /[a-z]+/i produce the same results.

Another useful modifier is s, which makes the dot metacharacter match newlines. The pattern (with delimiters) @.?@ matches a set of tags and the text between them, but only if that text is all on one line. To match text that may include newlines, use the s modifier: @.?@s

modifier m

modifier u 表示的是utf8编码，例如匹配utf8编码的全角空格（0xa1a1）。 

$pattern03 = "/^　+/u";			//全角空格

$out = preg_replace($pattern03,'',$out);

如果字符串不是utf8编码，那么会出现如下错误提示：

Warning: preg_replace() [function.preg-replace]: Compilation failed: invalid UTF-8 string at offset 1 in E:\AppServ\www\LazyPHP\controller\book.class.php on line 27

常用的表达式

Test the value of $html against the pattern [^<]+,The delimiter is @ since / occurs in the pattern

\(is_bold = preg_match('@[^<]+@',\)html);