PhpInfoViewHelper.php

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<?php
namespace TYPO3\CMS\Install\ViewHelpers;

class PhpInfoViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    protected $escapingInterceptorEnabled = FALSE;

    public function render() {
        return $this->removeAllHtmlOutsideBody(
            $this->changeHtmlToHtml5(
                $this->getPhpInfo()
            )
        );
    }

    public function getPhpInfo() {
        ob_start();
        phpinfo();

        return ob_get_clean();
    }

    protected function removeAllHtmlOutsideBody($html) {
        // Delete anything outside of the body tag and the body tag itself
        $html = preg_replace('/^.*?<body.*?>/is', '', $html);
        $html = preg_replace('/<\/body>.*?$/is', '', $html);

        return $html;
    }

    protected function changeHtmlToHtml5($html) {
        // Delete obsolete attributes
        $html = preg_replace('#\s(cellpadding|border|width)="[^"]+"#', '', $html);

        // Replace font tag with span
        return str_replace(array('<font', '</font>'), array('<span', '</span>'), $html);
    }
}