PhpErrorLogWriter.php

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<?php
namespace TYPO3\CMS\Core\Log\Writer;

use TYPO3\CMS\Core\Log\LogRecord;
use TYPO3\CMS\Core\Log\LogLevel;

class PhpErrorLogWriter extends AbstractWriter {

    public function writeLog(LogRecord $record) {
        $levelName = LogLevel::getName($record->getLevel());
        $data = '';
        $recordData = $record->getData();
        if (!empty($recordData)) {
            // According to PSR3 the exception-key may hold an \Exception
            // Since json_encode() does not encode an exception, we run the _toString() here
            if (isset($recordData['exception']) && $recordData['exception'] instanceof \Exception) {
                $recordData['exception'] = (string)$recordData['exception'];
            }
            $data = '- ' . json_encode($recordData);
        }
        $message = sprintf(
            'TYPO3 [%s] request="%s" component="%s": %s %s',
            $levelName,
            $record->getRequestId(),
            $record->getComponent(),
            $record->getMessage(),
            $data
        );
        if (FALSE === error_log($message)) {
            throw new \RuntimeException('Could not write log record to PHP error log', 1345036336);
        }
        return $this;
    }

}