PHP中错误控制@运算符

PHP支持一个错误控制运算符：at符号（@）。当添加在PHP中表达式之前时，任何错误消息都会被忽略。

如果你有一个自定义的错误处理函数set_error_handler()那它仍会被调用，但这个自定义错误处理程序可以（也应该）调用error_reporting()，当出发的错误之前有@符号，它将返回0。

如果track_errors功能启用时，任何错误消息将被保存在变量php_errormsg中。这个变量将对每个错误被覆盖，所以如果你想使用它要尽早检查。

原文：

PHP supports one error control operator: the at sign (@). When prepended to an expression in PHP, any error messages that might be generated by that expression will be ignored.

If you have set a custom error handler function with set_error_handler() then it will still get called, but this custom error handler can (and should) callerror_reporting() which will return 0 when the call that triggered the error was preceded by an @.

If the track_errors feature is enabled, any error message generated by the expression will be saved in the variable$php_errormsg. This variable will be overwritten on each error, so check early if you want to use it.