本段摘录自php manual
PHP supports one error control operator: the at sign (@). When prepended to an expression in PHP, any diagnostic error that might be >generated by that expression will be suppressed. If a custom error handler function is set with set_error_handler(), it will still be called even though the diagnostic has been suppressed, as >such the custom error handler should call error_reporting() and verify that the @ operator was used in the following way:
大意是：在php中使用@符号抑制的错误，仍能触发使用set_error_handler设置的自定义错误处理函数，所以需要在自定义的错误处理函数中过滤掉那些被抑制的错误，代码如下：
<?php
function my_error_handler($err_no
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