## 错误和异常 在编码的时候，我们无时无刻会遇到错误和异常，所以我们需要处理这些错误。 php的错误类型有 - E_ERROR 致命的错误。会中断程序的执行 - E_WARNING 警告。不会中断程序 - E_NOTICE 通知，运行时通知。表示脚本遇到可能会表现为错误的情况 - E_PARSE 解析错误，一般是语法错误。 - E_STRICT PHP 对代码的修改建议 - E_DEPRECATED 将会对在未来版本中可能无法正常工作的代码给出警告 ### 错误 在开发模式中，我们一般需要打开**error_reporting** 设置为**E_ALL**。然后把**display_errors** 设置为on 如果需要记录错误日志，则需要配置log_errors. 开发者可以 通过set_error_handle()自己接管错误。 ```php set_error_handle(function($errno,$errstr,$errfile,$errline){ }) /** * throw exceptions based on E_* error types */ set_error_handler(function ($err_severity, $err_msg, $err_file, $err_line, array $err_context) { // error was suppressed with the @-operator if (0 === error_reporting()) { return false;} switch($err_severity) { case E_ERROR: throw new ErrorException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_WARNING: throw new WarningException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_PARSE: throw new ParseException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_NOTICE: throw new NoticeException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_CORE_ERROR: throw new CoreErrorException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_CORE_WARNING: throw new CoreWarningException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_COMPILE_ERROR: throw new CompileErrorException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_COMPILE_WARNING: throw new CoreWarningException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_USER_ERROR: throw new UserErrorException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_USER_WARNING: throw new UserWarningException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_USER_NOTICE: throw new UserNoticeException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_STRICT: throw new StrictException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_RECOVERABLE_ERROR: throw new RecoverableErrorException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_DEPRECATED: throw new DeprecatedException ($err_msg, 0, $err_severity, $err_file, $err_line); case E_USER_DEPRECATED: throw new UserDeprecatedException ($err_msg, 0, $err_severity, $err_file, $err_line); } }); class WarningException extends ErrorException {} class ParseException extends ErrorException {} class NoticeException extends ErrorException {} class CoreErrorException extends ErrorException {} class CoreWarningException extends ErrorException {} class CompileErrorException extends ErrorException {} class CompileWarningException extends ErrorException {} class UserErrorException extends ErrorException {} class UserWarningException extends ErrorException {} class UserNoticeException extends ErrorException {} class StrictException extends ErrorException {} class RecoverableErrorException extends ErrorException {} class DeprecatedException extends ErrorException {} class UserDeprecatedException extends ErrorException {} ``` #### PHP7的错误处理 PHP 7 改变了大多数错误的报告方式。error可以通过exception异常进行捕获到.不能通过try catch捕获。但是可以通过注册到set_exception_handle捕获。 - Throwable - Error - Exception ```php try { // Code that may throw an Exception or Error. } catch (Throwable $t) { // Executed only in PHP 7, will not match in PHP 5 } catch (Exception $e) { // Executed only in PHP 5, will not be reached in PHP 7 } ``` ### 异常 捕获异常可以通过try catch 语句 ```php try{ //异常的代码 }catch (Exception $e){ //处理异常 }finally{ //最后执行的 } ```