php中异常处理方法小结

class NotFoundException extends Exception{}

PHP编程class InputException extends Exception{}

PHP编程class DBException extends Exception{}

function exception_uncaught_handler(Exception $e) {???
header('Content-type:text/html; charset=utf-8');???
if ($e instanceof NotFoundException)???
exit($e->getMessage());???
elseif ($e instanceof DBException)???
exit($e->getMessage());???
else???
exit($e->getMessage());???
}???
set_exception_handler('exception_uncaught_handler');

$this->resConn = mysql_connect ($CONFIGS['db_host'],$CONFIGS['db_user'],$CONFIGS['db_pwd']);???
if (false == is_resource($this->resConn))???
throw new DBException('数据库连接失败.'.mysql_error($this->resConn));

if (0 != strcmp($curAlbum->interest_id,$it))??

PHP编程throw new NotFoundException('很抱歉,你所拜访的相册不存在');

<?php
class customException extends Exception
{
public function errorMessage()
{
//error message
$errorMsg = 'Error on line '.$this->getLine().' in '.$this->getFile()
.': <b>'.$this->getMessage().'</b> is not a valid E-Mail address';
return $errorMsg;
}
}
?
$email = "someone@example.com";
?
try
?{
?//check if?
?if(filter_var($email,FILTER_VALIDATE_EMAIL) === FALSE)
? {
? //throw exception if email is not valid
? throw new customException($email);
? }
?//check for "example" in mail address
?if(strpos($email,"example") !== FALSE)
? {
? throw new Exception("$email is an example e-mail");
? }
?}
?
catch (customException $e)
?{
?echo $e->errorMessage();
?}
?
catch(Exception $e)
?{
?echo $e->getMessage();
?}
?>

function num($num){
?if ($num>1){//异常抛出条件
? $msg="数值不能大于1″;//异常提示信息
? throw new Exception($msg);//抛出异常
?}
?echo "数值小于1″;
}
//在 "try" 代码块中触发异常
try {
?num(3);
?echo "执行正常";
}
//捕获异常
catch (Exception $e){
?echo "错误信息：".$e->getMessage();//Exception()的系统办法获取异常信息
?echo "错误文件：".$e->getFile();//Exception()的系统办法获取异常文件名
?echo "行数：".$e->getLine();//Exception()的系统办法获取异常行数
}
//======================================================================
echo "<br>========================================================<br>";
//扩展基本异常类
function checkEmail($email){//定义一个可以抛出异常的判断EMAIL合法性的函数
?if (filter_var($email,FILTER_VALIDATE_EMAIL)==false){
? throw new checkEmailException($email);//抛出异常用EMAIL做参数
?}
?echo "邮件合法";
}
class checkEmailException extends Exception{//定义扩展异常类
?public function errormsg(){
? $msg="错误原因：".$this->getMessage()."不是一个合法的EMAIL地址!";
? $msg.="错误文件名：".$this->getFile();
? $msg.="错误行数：".$this->getLine();
? echo $msg;
?}
}
$email="email…..@chhua.com";
try {//触发异常
?checkEmail($email);
}
//捕获异常
catch (checkEmailException $e){
?$e->errormsg();
}
//==================================多个异常的捕获
echo "<br>===================================================<br>";
class ex1 extends Exception{//定义一个异常类
?public function msg(){
? $msg="错误原因：".$this->getMessage()."大于100<br>";
? $msg.="错误文件：".$this->getFile()."<Br>";
? $msg.="错误代码：".$this->getCode()."<br>";
? $msg.="行数：".$this->getLine()."<br>";
? echo $msg;
?}
}
class ex2 extends Exception{//定义一个异常类
??????? public function msg(){
? $msg="错误原因：".$this->getMessage()."等于100<br>";
? $msg.="错误文件：".$this->getFile()."<Br>";
? $msg.="行数：".$this->getLine()."<br>";
? echo $msg;
?}
}
$num2=100;
try {
?if ($num2>100){//当条件满足时触发
? throw new ex1($num2);
?}
?if ($num2==100){//当条件满足时触发
? throw new ex2($num2);
?}
}
catch (ex2 $e){//捕获触发的异常
?$e->msg();
}
catch (ex1 $e){//捕获触发的异常
?$e->msg();
}