How to use try/catch in php7

1. The error is thrown directly here, but it is not caught.

2. The variable $a here is not declared

3. Use the symbol "@" to suppress errors

4. Set user-defined settings through the function set_exception_handler() Exception handling function

5. Set the user-defined error handling function through the function set_error_handler()

6. Use multiple catches to capture different types of errors, and use to organize the operations after exception capture

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