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 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.
?php /* Intentional file error */ $my_file = @file ('non_existent_file') or die ("Failed opening file: error was '$php_errormsg'"); // this works for any expression, not just functions: $value = @$cache[$key]; // will not issue a notice if the index $key doesn't exist. ? |
注: The @-operator works only on expressions. A simple rule of thumb is: if you can take the value of something, you can prepend the @ operator to it. For instance, you can prepend it to variables, function and include() calls, constants, and so forth. You cannot prepend it to function or class definitions, or conditional structures such as if and foreach, and so forth.
See also error_reporting().
注: The "@" error-control operator prefix will not disable messages that are the result of parse errors.
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