What does error_reporting(E_ALL & ~E_NOTICE) mean?

Error levels are bit flags. E_ALL is a mask of every level, and the & ~E_NOTICE clears the notice bit, so the expression reports all errors and warnings except notices. You can compose any subset with | to include and & ~ to exclude.

What is the difference between an error level and an exception in PHP?

Error levels (E_ERROR, E_WARNING, E_NOTICE) are the classic procedural error system handled by error_reporting and set_error_handler. Exceptions are objects implementing Throwable that you catch with try/catch. Since PHP 7, many fatal conditions are thrown as Error objects you can also catch.

Can I catch a fatal error in PHP?

An E_ERROR cannot be caught with try/catch, but E_RECOVERABLE_ERROR can be intercepted with a custom error handler. Since PHP 7, engine failures are thrown as Error (a Throwable), so catch (\Throwable $e) lets you handle both Error and Exception.

What is the difference between LogicException and RuntimeException?

LogicException represents bugs detectable in the code itself, such as InvalidArgumentException, and should be fixed rather than handled. RuntimeException covers errors that can only surface while running, such as OutOfBoundsException, and is the family you typically catch.

Is anything I search uploaded?

No. Both tables and the search run entirely in your browser. Nothing you type is sent anywhere.

PHP Error Levels & Codes

This is a searchable reference for PHP’s two error systems — the procedural error level constants (E_ERROR, E_WARNING, E_NOTICE, E_DEPRECATED and friends) and the object-oriented Throwable hierarchy of Error and Exception classes. It pairs each error constant with its bitmask value and each exception class with its parent and typical cause.

How it works

PHP error levels are bit flags: every constant is a distinct power of two (E_ERROR = 1, E_WARNING = 2, E_NOTICE = 8, and so on) and E_ALL is the combined mask. You configure which levels are reported by composing them — | to include a level and & ~ to exclude one. For example E_ALL & ~E_DEPRECATED reports everything except deprecation notices.

Separately, since PHP 7 the engine throws objects for many failures. The root is the Throwable interface, which splits into Error (engine and type problems like TypeError, DivisionByZeroError) and Exception (user-land errors, including the SPL classes LogicException and RuntimeException). Catching \Throwable handles both branches; catching \Exception alone misses the Error family.

Example

A reporting mask plus catching the modern Throwable tree:

error_reporting(E_ALL & ~E_NOTICE);     // everything except notices

try {
    $r = intdiv(10, 0);                  // throws DivisionByZeroError (an Error)
} catch (\Throwable $e) {                // catches Error AND Exception
    echo get_class($e) . ": " . $e->getMessage();
}

Note that DivisionByZeroError extends ArithmeticError, which extends Error, which implements Throwable — so a plain catch (\Exception $e) would not catch it, but catch (\Throwable $e) does. Everything runs in your browser; nothing is uploaded.

PHP Error Levels & Codes

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How it works

Example