随缘

/*utf8编码时截取等长中英文字串*/ //英文标点[.,\"\\?!:_']   
<?   
function substr_utf8($string,$start,$length)   
{       //by aiou   
     $chars = $string;   
     //echo $string[0].$string[1].$string[2];   
     $i=0;   
     do{   
        if (preg_match ("/[0-9a-zA-Z]/", $chars[$i])){//纯英文   
            $m++;   
        }   
    else {$n++;     }//非英文字节,   
        $k = $n/3+$m/2;   
        $l = $n/3+$m;//最终截取长度；$l = $n/3+$m*2？   
        $i++;   
    } while($k < $length);   
     $str1 = mb_substr($string,$start,$l,'utf-8');//保证不会出现乱码   
     return $str1;   
}

$foo = 'hello';
echo $foo.' world!<br />';
echo "$foo world!<br />";
echo '$foo world!<br />';

$foo = 'foo';
$Foo = 'Foo';
echo "$foo<br />";
echo "$Foo<br />";
echo bar()."<br />";
echo Bar()."<br />";
 
function bar() {
	echo 'bar';
}

$a = 5;
$b = $a;
$a = 7; // 此时$a=7, 而$b仍然等于5

$a = 5;
$b = &$a;
$a = 7; // 此时$a和$b都等于7

$out = `dir c:` // windows, Linux为 `ls -la`
echo $out;

// 例如以下的代码将创建一个1~10的数字数组
$numbers = range(1, 10);
//range()函数具有一个可选的第三个参数, 这个参数允许设定值之间的步幅. 例如创建一个1~10之间的奇数数组
$odds = range(1, 10, 2);
//range()函数也可以对字符进行操作, 如下
$letters = range('a', 'z');

 $products = array('Tires', 'Oil', 'Spark Plugs');
 sort($products);
 $prices = array(100, 10, 4);
 sort($prices);

 // 这是一个普通的二维数组, 存储了3种产品的代码,说明和价格.
 $products = array(array('TLR', 'Tires', 100),
		array('OIL', 'Oil', 10),
		array('SPK', 'Spark Plugs', 4));
 
 // 以下代码对订单数组中的第二列(说明)按字母进行排序
 function compare($x, $y) {
	if ($x[1] == $y[1])
		return 0;
	else if ($x[1] < $y[1])
		return -1;
	else
		return 1;
 }
 
 usort($products, 'compare')
 
 // 同时实现反向排序
 function reverse_compare($x, $y) {
	if ($x[1] == $y[1])
		returnn 0;
	else if ($x[1] < $y[1])
		return 1;
	else
		return -1;
 }
 
 usort($products, 'reverse_compare');

<?php 
// PHP 5 
require_once('cmd_php5/Command.php'); 
class CommandManagerException extends Exception{} 
class IllegalCommandException extends Exception{} 
 
class CommandManager { 
    private $cmdDir = "cmd_php5"; 
 
    function __construct() { 
        if (!is_dir($this->cmdDir)) { 
            throw new CommandManagerException("directory error: $this->cmdDir"); 
        } 
    } 
 
    function getCommandObject($cmd) { 
        $path = "{$this->cmdDir}/{$cmd}.php"; 
        if (!file_exists($path)) { 
            throw new IllegalCommandException("Cannot find $path"); 
        } 
        require_once $path; 
        if (!class_exists($cmd)) { 
            throw new IllegalCommandException("class $cmd does not exist"); 
        } 
 
        $class = new ReflectionClass($cmd); 
        if (!$class->isSubclassOf(new ReflectionClass('Command'))) { 
            throw new IllegalCommandException("$cmd is not a Command"); 
        } 
        return $class->newInstance(); 
    } 
} 
?>

<?php 
// PHP 5 
try { 
    $mgr = new CommandManager(); 
    $cmd = $mgr->getCommandObject('realcommand'); 
    $cmd->execute(); 
} catch (CommandManagerException $e) { 
    die($e->getMessage()); 
} catch (IllegalCommandException $e) { 
    error_log($e->getMessage()); 
    print "attempting recovery\n"; 
    // perhaps attempt to invoke a default command? 
} catch (Exception $e) { 
    print "Unexpected exception\n"; 
    die($e->getMessage()); 
} 
?>

            try
            {
                if (comPort.IsOpen) comPort.Close();
 
                comPort.BaudRate = int.Parse(_baudRate);
                comPort.DataBits = int.Parse(_dataBits);
                comPort.StopBits = (StopBits)Enum.Parse(typeof(StopBits), _stopBits);
                comPort.Parity = (Parity)Enum.Parse(typeof(Parity), _parity);
                comPort.PortName = _portName;
                comPort.Open();
                if (this.IsBatch)
                    DisplayData(MsgType.Normal, "当前模式:批量传输,正在接收数据..\n");
                else
                    DisplayData(MsgType.Normal, "当前模式:实时传输,正在接受数据..\n");
                return true;
            }
            catch (Exception ex)
            {
                //DisplayData(MsgType.Error, ex.Message);
                FormUtility.Alert(ex.Message);
                return false;
            }

<?PHP
function ErrorHandler($errno, $errmsg, $errfile, $errline) {
	if ($errno == E_USER_ERROR) {
		$msg = "<strong>Custom Error:</strong>$errmsg<br />\n";
		$msg .= "File:$errfile<br />\n";
		$msg .= "Line Number:$errline<br />\n";
	}
	echo $msg;
	// 记录错误信息
	error_log(date("[Y-m-d H:i:s]")." -[".$_SERVER['REQUEST_URI']."] :".$msg."\n", 3, 'log.txt');
//	exit(); // 必要时必须终止脚本执行.
}
 
// set_error_handler()函数用于让用户自定义错误处理函数
// set_error_handler(error_function, error_type)
// error_function 必须, 制定发生错误时运行的函数
// error_type 可选, 规定不同的错误级别提示的不同信息, 默认是"E_ALL"
set_error_handler('ErrorHandler');
 
$foo = 2;
if ($foo > 1) {
	// trigger_error()接收一个错误信息和一个常量作为参数, 
	// 常量为E_USER_ERROR -> a fatal error
	//		 E_USER_WARNING -> a non-fatal error
	//		 E_USER_NOTICE -> a report that may not represent an error 
	trigger_error("A custom error has been trigglered", E_USER_ERROR);
}
?>

<?php
function ExceptionHandler($e) {
	echo "<strong>Exception:</strong>".$e->getMessage();
	echo "Stack Trace String:".$e->getTraceAsString();
}
 
// set_exception_handler()函数用于让用户自定义异常处理函数
// set_exception_handler(exception_function)
// 该函数需要抛出的exception对象最为参数
// 在这个异常处理程序被执行后, 脚本会停止执行
set_exception_handler('ExceptionHandler');
 
throw new Exception('Uncaught Exception occurred');
?>

// 在这里定义$sec1为一个二维数组
$sec1 = $db->fetchAll("select * from category");
for($i=0; $i<count($sec1); $i++) {
	$sec1[$i]['news'] = $db->fetchAll("select * from news where cid = ".$sec1[$i]['id']." order by id desc limit 0, 5");
}
 
$smarty->assign('sec1', $sec1); 
$smarty->left_delimiter = "<{";
$smarty->right_delimiter = "}>";
$smarty->display('news.html');

<{section name=sec1 loop=$sec1}>
<div class="inner">
<h1><a href="/category/<{$sec1[sec1].id}>.html"><{$sec1[sec1].name}></a></h1>
	<ul>
	<{section name=sec2 loop=$sec1[sec1].news}>
		<li>
		<a href="/news/<{$sec1[sec1].news[sec2].id}>.html" target="_blank">
		<{$sec1[sec1].news[sec2].title}>
		</a>
		</li>
	<{/section}>
	</ul>				
</div>
<{/section}>