ErrorHandler.php

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<?php

namespace Elgg\Application;

use Elgg\Application;
use Elgg\Loggable;
use Exception;
use Psr\Log\LogLevel;

class ErrorHandler {

    use Loggable;

    public function __invoke($errno, $errmsg, $filename, $linenum, $vars) {
        $error = date("Y-m-d H:i:s (T)") . ": \"$errmsg\" in file $filename (line $linenum)";

        switch ($errno) {
            case E_USER_ERROR:
                $this->log(LogLevel::ERROR, "PHP ERROR: $error");

                if (Application::isCoreLoaded()) {
                    Application::$_instance->_services->systemMessages->addErrorMessage("ERROR: $error");
                }

                // Since this is a fatal error, we want to stop any further execution but do so gracefully.
                throw new Exception($error);

            case E_WARNING :
            case E_USER_WARNING :
            case E_RECOVERABLE_ERROR: // (e.g. type hint violation)

                // check if the error wasn't suppressed by the error control operator (@)
                if (error_reporting()) {
                    $this->log(LogLevel::WARNING, "PHP: $error");
                }
                break;

            default:
                $this->log(LogLevel::NOTICE, "PHP NOTICE: $error");
                break;
        }

        return true;
    }
}