PHP 的异常处理、错误的抛出及错误回调函数，异常处理回调函数_PHP教程

<span>error_reporting</span>(<span>E_ALL</span>&~<span>E_NOTICE</span>) ; <span>//</span><span> 除了E_NOTICE其他异常都会被触发 （E_ALL&~E_NOTICE 的二进制运算结果是：E_NOTICE对应位的值被设置为0,应注意到，错误和日志记录值都是一个二进制数,某一位设置为1）</span>

<span>try</span><span>{

  </span><span>//</span><span> you codes that maybe cause an error</span>
<span>
}</span><span>catch</span>(<span>Exception</span> <span>$err</span>){ <span>//</span><span> 这个错误对象需要声明类型， Exception 是系统默认异常处理类</span>

    <span>echo</span> <span>$err</span>-><span>getMessage();

}

 

</span><span>//</span><span>thrown 可以抛出一个异常，如：</span>
<span>
thrown </span><span>new</span> <span>Exception</span>('an error');

<span>try</span><span> {

    </span><span>if</span> ( <span>empty</span>( <span>$var1</span> ) ) <span>throw</span> <span>new</span><span> NotEmptyException();
    </span><span>if</span> ( <span>empty</span>( <span>$var2</span> ) ) <span>throw</span> <span>new</span><span> NotEmptyException();
    </span><span>if</span> ( ! <span>preg_match</span>() ) <span>throw</span> <span>new</span><span> InvalidInputException();

    </span><span>$model</span>-><span>write();
    </span><span>$template</span>->render( 'success'<span> );
  
} </span><span>catch</span> ( NotEmptyException <span>$e</span><span> ) {

  </span><span>$template</span>->render( 'error_empty'<span> );

} </span><span>catch</span> ( InvalidInputException <span>$e</span><span> ) {

  </span><span>$template</span>->render( 'error_preg'<span> );

}</span>

<span>Exception</span><span> {
</span><span>/*</span><span> 属性 </span><span>*/</span>
<span>protected</span> <span>string</span> <span>$message</span><span> ;
</span><span>protected</span> int <span>$code</span><span> ;
</span><span>protected</span> <span>string</span> <span>$file</span><span> ;
</span><span>protected</span> int <span>$line</span><span> ;
</span><span>/*</span><span> 方法 </span><span>*/</span>
<span>public</span> __construct ([ <span>string</span> <span>$message</span> = "" [, int <span>$code</span> = 0 [, <span>Exception</span> <span>$previous</span> = <span>null</span><span>]]] )
</span><span>final</span> <span>public</span> <span>string</span> getMessage ( void ) <span>//</span><span>异常抛出的信息</span>
<span>final</span> <span>public</span> <span>Exception</span> getPrevious ( void ) <span>//</span><span>前一异常</span>
<span>final</span> <span>public</span> int getCode ( void ) <span>//</span><span>异常代码，这是用户自定义的</span>
<span>final</span> <span>public</span> <span>string</span> getFile ( void ) <span>//</span><span>发生异常的文件路劲</span>
<span>final</span> <span>public</span> int getLine ( void ) <span>//</span><span>发生异常的行</span>
<span>final</span> <span>public</span> <span>array</span> getTrace ( void ) <span>//</span><span>异常追踪信息(array)</span>
<span>final</span> <span>public</span> <span>string</span> getTraceAsString ( void ) <span>//</span><span>异常追踪信息(string)</span>
<span>public</span> <span>string</span> __toString ( void ) <span>//</span><span>试图直接 将异常对象当作字符串使用时调用子函数的返回值</span>
<span>final</span> <span>private</span> void __clone ( void ) <span>//</span><span>克隆异常对象时调用</span>
}

calss MyException <span>extends</span> <span>Exception</span><span>{
   </span><span>public</span> errType = 'default'<span>;
   </span><span>public</span> <span>function</span> __construct(<span>$errType</span>=''<span>){
      </span><span>$this</span>->errType = <span>$errType</span><span>;
  }

}
 


</span><span>try</span>{  <span>//</span><span> you codes that maybe cause an error</span>
   thrown <span>new</span> MyException('an error'<span>);
}</span><span>catch</span>(MyException <span>$err</span>){ <span>//</span><span> 这个错误对象需要声明类型 </span>
   <span>echo</span> <span>$err</span>-><span>errType(); 
}</span><span>catch</span>(ErrorException <span>$err</span>){ <span>//</span><span>ErrorException 是 PHP 5 增加的异常类以便将错误封装为异常，可以更好地处理错误信息，继承于 Exception</span>
   <span>echo</span> 'error !'<span>; 
}</span><span>catch</span>(<span>Exception</span> <span>$err</span><span>){
   redirect(</span>'/error.php'<span>);
 }</span>

<span>set_exception_handler</span>('exceptionHandlerFun')  <span>//</span><span>发生 Exception 或其 子类的 异常是会调用此函数</span>

<span>function</span> exceptionHandlerFun(<span>$errObj</span>){  <span>//</span><span> Exception 异常的回调函数 只有一个参数，就是抛出的异常对象。

 //.......</span>
<span>
}</span>

<span>function</span><span> shutdownfunction(){

    </span><span>echo</span> 'script is end'<span>;

}

</span><span>register_shutdown_function</span>("shutdownfunction");　

<span>set_error_handler</span>(<span>callback</span> functionName[,user_error_type]); <span>//</span><span> 为 trigger_error() 设置一个回调函数来处理错误，包括系统抛出的错误和用户使用 trigger_error() 函数触发的错误。</span>

 

<span>function</span> error_handler(<span>$errorType</span>, <span>$errorMsg</span>, <span>$errorFile</span>, <span>$errorLine</span><span> ) {
    </span><span>echo</span> '<div>;
    </span><span>throw</span> <span>new</span> ErrorException(<span>$errorMsg</span>, 0, <span>$errorType</span>, <span>$errorFile</span>, <span>$errorLine</span><span>);
}
</span><span>set_error_handler</span>('error_handler'<span>);
</span><span>count</span>();