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PHP Exception getPrevious() 方法
tryphp_exception_getprevious
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<!DOCTYPE html> <html> <body> <?php try { try { throw new Exception("An error occurred", 1); } catch(Exception $e1) { throw new Exception("Another error occurred", 2, $e1); } } catch (Exception $e2) { echo $previous = $e2->getPrevious(); echo $previous->getMessage(); } ?> </body> </html>