考虑这两个例子
<?php
function throw_exception() {
// Arbitrary code here
throw new Exception('Hello, Joe!');
}
function some_code() {
// Arbitrary code here
}
try {
throw_exception();
} catch (Exception $e) {
echo $e->getMessage();
}
some_code();
// More arbitrary code
?>
and
<?php
function throw_exception() {
// Arbitrary code here
throw new Exception('Hello, Joe!');
}
function some_code() {
// Arbitrary code here
}
try {
throw_exception();
} catch (Exception $e) {
echo $e->getMessage();
} finally {
some_code();
}
// More arbitrary code
?>
有什么不同?是否存在第一个示例无法执行的情况some_code()
,但第二个会吗?我完全没有抓住重点吗?
如果捕获异常(任何异常),则两个代码示例是等效的。但是如果你只在类块中处理某些特定的异常类型并且发生另一种异常,那么some_code();
仅当您有一个时才会被执行finally
block.
try {
throw_exception();
} catch (ExceptionTypeA $e) {
echo $e->getMessage();
}
some_code(); // Will not execute if throw_exception throws an ExceptionTypeB
but:
try {
throw_exception();
} catch (ExceptionTypeA $e) {
echo $e->getMessage();
} finally {
some_code(); // Will be execute even if throw_exception throws an ExceptionTypeB
}
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