What is $errno in set

set_error_handler callback function accepts 2 mandatory arguments and 3 optional arguments. One of which is $errno (first one).

What is its use ? Is it integer representation of E_ALL or E_NOTICE .... ?

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The $errno contains the level of the error raised, as an integer.

I think this example will make it clear (not my code):

 switch ($errno) {
    case E_USER_ERROR:
        echo "<b>My ERROR</b> [$errno] $errstr<br />n";
        echo "  Fatal error on line $errline in file $errfile";
        echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")<br />n";
        echo "Aborting...<br />n";
        exit(1);
        break;

    case E_USER_WARNING:
        echo "<b>My WARNING</b> [$errno] $errstr<br />n";
        break;

    case E_USER_NOTICE:
        echo "<b>My NOTICE</b> [$errno] $errstr<br />n";
        break;

    default:
        echo "Unknown error type: [$errno] $errstr<br />n";
        break;
    }

---

From the docs for set_error_handler() regarding the error handler:

The first parameter, errno , contains the level of the error raised, as an integer.

It will be one of the predefined error constants, eg E_USER_WARNING , E_NOTICE , etc.

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