Error Control Operators
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.
?>
Note: 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() and the manual section for Error
Handling and Logging functions.
Note: The "@" error-control operator prefix will
not disable messages that are the result of parse errors.
Warning
Currently the "@" error-control operator prefix
will even disable error reporting for critical errors that
will terminate script execution. Among other things, this
means that if you use "@" to suppress errors from
a certain function and either it isn't available or has
been mistyped, the script will die right there with no indication
as to why.
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