GlobalDebugFunctions.php

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<?php
        // Simple debug function which prints output immediately
    function xdebug($var = '', $debugTitle = 'xdebug') {
            // If you wish to use the debug()-function, and it does not output something,
            // please edit the IP mask in TYPO3_CONF_VARS
        if (!\TYPO3\CMS\Core\Utility\GeneralUtility::cmpIP(\TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('REMOTE_ADDR'), $GLOBALS['TYPO3_CONF_VARS']['SYS']['devIPmask'])) {
            return;
        }
        \TYPO3\CMS\Core\Utility\DebugUtility::debug($var, $debugTitle);
    }

        // Debug function which calls $GLOBALS['error'] error handler if available
    function debug($variable = '', $name = '*variable*', $line = '*line*', $file = '*file*', $recursiveDepth = 3, $debugLevel = E_DEBUG) {
            // If you wish to use the debug()-function, and it does not output something,
            // please edit the IP mask in TYPO3_CONF_VARS
        if (!\TYPO3\CMS\Core\Utility\GeneralUtility::cmpIP(\TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('REMOTE_ADDR'), $GLOBALS['TYPO3_CONF_VARS']['SYS']['devIPmask'])) {
            return;
        }
        if (is_object($GLOBALS['error']) && @is_callable(array($GLOBALS['error'], 'debug'))) {
            $GLOBALS['error']->debug($variable, $name, $line, $file, $recursiveDepth, $debugLevel);
        } else {
            $title = $name === '*variable*' ? '' : $name;
            $group = $line === '*line*' ? NULL : $line;
            \TYPO3\CMS\Core\Utility\DebugUtility::debug($variable, $title, $group);
        }
    }

    function debugBegin() {
        if (is_object($GLOBALS['error']) && @is_callable(array($GLOBALS['error'], 'debugBegin'))) {
            $GLOBALS['error']->debugBegin();
        }
    }

    function debugEnd() {
        if (is_object($GLOBALS['error']) && @is_callable(array($GLOBALS['error'], 'debugEnd'))) {
            $GLOBALS['error']->debugEnd();
        }
    }