PHP supports error control operator (@) which can be added to an expression beginning. This operator suppresses notices, warnings, and errors that might be generated by the expression.
In versions prior to PHP 8.0, the @ operator allows suppressing any error messages. Since PHP 8.0, the @ operator no longer suppress fatal errors. This includes these types of errors:
| No. | Constant | Description |
|---|---|---|
| 1. | E_ERROR | Fatal run-time errors. |
| 2. | E_CORE_ERROR | Fatal errors that occurs in PHP's initial startup. |
| 3. | E_COMPILE_ERROR | Fatal compile-time errors. |
| 4. | E_USER_ERROR | Errors that generated by user using trigger_error function. |
| 5. | E_RECOVERABLE_ERROR | Catchable fatal error. |
| 6. | E_PARSE | Compile-time parse errors. |
Let's say we have a function that generates a user-defined error. A function is called by adding the @ operator at the beginning of a function name.
<?php
function run() {
trigger_error('Not implemented', E_USER_ERROR);
}
@run();
echo 'This message wouldn\'t be printed';In versions prior to PHP 8.0, the code snippet does not emit any errors because a user-defined error was suppressed by the @ operator. However, code execution will be stopped.
In PHP 8.0 or newer versions, a user-defined error is not suppressed, and a code snippet emits a fatal error. Of course, code execution will be stopped.
Fatal error: Not implemented in main.php on line 4Note that the @ operator continue to suppress warnings and notices.
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