PHP异常类及异常处理操作实例详解

try{
#some codes
throw new Exception("message"[,code[,...]]);
}
catch(Exception $ex){
#some codes
}

Exception {
/ 属性 /
protected string $message ;
protected int $code ;
protected string $file ;
protected int $line ;
/ 方法 /
public __construct ([ string $message = "" [, int $code = 0 [, Exception $previous = NULL ]]] )
final public string getMessage ( void )
final public Exception getPrevious ( void )  //获取异常链中前一个异常
final public int getCode ( void )
final public string getFile ( void )
final public int getLine ( void )
final public array getTrace ( void )   //获取异常追踪信息
final public string getTraceAsString ( void )  //字符串方式返回异常追踪信息
public string __toString ( void )
final private void __clone ( void )
}

<?php
try {
 throw new Exception("Some error message", 30);//抛出异常，设置异常代号为30
} catch(Exception $e) {
 echo "Exception:file:".$e->getFile().",message:" . $e->getMessage().",code:".$e->getCode()."line:".$e->getLine();
}
?>

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;
 }
 }

try{
throw new customException("这是自定义异常。");
}
catch(customException $ex){
#some codes
}

try{
 try{
  throw new Exception("第一个异常");
 }
 catch(Exception $e1){
  #相关处理
  throw new Exception("处理后抛出异常");//抛出异常
 }
}
catch(Exception $e2){
 #相关处理
}

<?php
function myException($exception)
{
echo "<b>Exception:</b> " , $exception->getMessage();
}
set_exception_handler('myException');
throw new Exception('Uncaught Exception ourred');
?>