php 错误处理与异常处理方法与实例教程(1/2)
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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