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php 错误处理与异常处理方法与实例教程(1/2)

Jun 13, 2016 am 09:57 AM
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php 错误处理与异常处理方法与实例教程 在程序开发中,错误处理这一块是非常重要的,今天本文章就来告诉他关于在php开发中,错误处理函数并且举例说明错误处理的重要性。

php教程 错误处理与异常处理方法与实例教程
在程序开发中,错误处理这一块是非常重要的,今天本文章就来告诉他关于在php开发中,错误处理函数并且举例说明错误处理的重要性。

  1、内置异常处理类。
  2、捕获并处理异常的示例。
  3、exception类的成员函数getmessage()。
  4、exception类的成员函数getfile()。
  5、exception类的成员函数getline()。
  6、显示警告或错误信息。
  7、自定义错误处理函数。

*/

 // 1、内置异常处理类。

 class exception
{
    protected $message = 'unknown exception';   // 异常信息
    protected $code = 0;                        // 用户自定义异常代码
    protected $file;                            // 发生异常的文件名
    protected $line;                            // 发生异常的代码行号

    function __construct($message = null, $code = 0);

    final function getmessage();                // 返回异常信息
    final function getcode();                   // 返回异常代码
    final function getfile();                   // 返回发生异常的文件名
    final function getline();                   // 返回发生异常的代码行号
    final function gettrace();                  // backtrace() 数组
    final function gettraceasstring();          // 已格成化成字符串的 gettrace() 信息

    function __tostring();                      // 可输出的字符串
}
 

// 2、捕获并处理异常的示例。

 try
{
    $error = '抛出异常信息,并且跳出try块
';
    if(is_dir('./test'))
    {
        echo '检测到../ch16是一个目录';
        echo '
';
        echo '可能继续做其他一些操作';
        echo '
';
        echo '....';
        echo '
';
    }
    else
    {
        throw new exception($error,12345);
    }
    echo '上面throw异常的话,这行代码不会执行,转而执行catch块
';
}
catch(exception $e)
{
    echo '捕获异常: ' . $e->getmessage() . "
错误代码:" . $e->getcode().'
';    //显示$error和123456
    echo '
';
}

echo '继续执行';

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