


PHP exception handling: understand system behavior through exception tracking
PHP exception handling: Understanding system behavior through exception tracking Exceptions are the mechanism used by PHP to handle errors, and exceptions are handled by exception handlers. The exception class Exception represents general exceptions, while the Throwable class represents all exceptions. Use the throw keyword to throw exceptions and use try...catch statements to define exception handlers. In practical cases, exception handling is used to capture and handle DivisionByZeroError that may be thrown by the calculate() function to ensure that the application can fail gracefully when an error occurs.
PHP Exception Handling: Understand system behavior through exception tracking
Introduction to Exception Handling
Exceptions are a mechanism in PHP for handling errors and exceptions. When an exception is thrown, it interrupts the normal execution flow of the program and is handled by the exception handler.
Exception classes
The exception classes in PHP are Exception
and Throwable
. The Exception
class represents general exceptions, while the Throwable
class represents all exceptions, including errors and fatal errors.
Throw an exception
You can use the throw
keyword to throw an exception. For example:
throw new Exception('错误信息');
Exception handler
When an exception is thrown, it will be handled by the exception handler. You can use the try...catch
statement to define an exception handler:
try { // 代码可能抛出异常 } catch (Exception $e) { // 处理异常 }
Practical case
Suppose we have a functioncalculate()
, it may throw DivisionByZeroError
:
function calculate($num1, $num2) { if ($num2 == 0) { throw new DivisionByZeroError('除数不能为零'); } return $num1 / $num2; }
When calling the calculate()
function, we can use exception handling to catch and Handling Errors:
try { $result = calculate(10, 2); echo $result; } catch (DivisionByZeroError $e) { echo '发生除零错误:' . $e->getMessage(); }
Output:
5
By catching exceptions and providing meaningful messages, we can ensure that the application can still fail gracefully when an error occurs.
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