ErrorHandler.php

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<?php
namespace Magento\Framework\App;

class ErrorHandler
{
    protected $errorPhrases = [
        E_ERROR => 'Error',
        E_WARNING => 'Warning',
        E_PARSE => 'Parse Error',
        E_NOTICE => 'Notice',
        E_CORE_ERROR => 'Core Error',
        E_CORE_WARNING => 'Core Warning',
        E_COMPILE_ERROR => 'Compile Error',
        E_COMPILE_WARNING => 'Compile Warning',
        E_USER_ERROR => 'User Error',
        E_USER_WARNING => 'User Warning',
        E_USER_NOTICE => 'User Notice',
        E_STRICT => 'Strict Notice',
        E_RECOVERABLE_ERROR => 'Recoverable Error',
        E_DEPRECATED => 'Deprecated Functionality',
        E_USER_DEPRECATED => 'User Deprecated Functionality',
    ];

    public function handler($errorNo, $errorStr, $errorFile, $errorLine)
    {
        if (strpos($errorStr, 'DateTimeZone::__construct') !== false) {
            // there's no way to distinguish between caught system exceptions and warnings
            return false;
        }

        $errorNo = $errorNo & error_reporting();
        if ($errorNo == 0) {
            return false;
        }

        $msg = isset($this->errorPhrases[$errorNo]) ? $this->errorPhrases[$errorNo] : "Unknown error ({$errorNo})";
        $msg .= ": {$errorStr} in {$errorFile} on line {$errorLine}";
        throw new \Exception($msg);
    }
}