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Filename : DebugExtension.php
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<?php

/*
 * This file is part of Twig.
 *
 * (c) Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig\Extension {
use Twig\TwigFunction;

final class DebugExtension extends AbstractExtension
{
    public function getFunctions(): array
    {
        // dump is safe if var_dump is overridden by xdebug
        $isDumpOutputHtmlSafe = \extension_loaded('xdebug')
            // false means that it was not set (and the default is on) or it explicitly enabled
            && (false === ini_get('xdebug.overload_var_dump') || ini_get('xdebug.overload_var_dump'))
            // false means that it was not set (and the default is on) or it explicitly enabled
            // xdebug.overload_var_dump produces HTML only when html_errors is also enabled
            && (false === ini_get('html_errors') || ini_get('html_errors'))
            || 'cli' === \PHP_SAPI
        ;

        return [
            new TwigFunction('dump', 'twig_var_dump', ['is_safe' => $isDumpOutputHtmlSafe ? ['html'] : [], 'needs_context' => true, 'needs_environment' => true, 'is_variadic' => true]),
        ];
    }
}
}

namespace {
use Twig\Environment;
use Twig\Template;
use Twig\TemplateWrapper;

function twig_var_dump(Environment $env, $context, ...$vars)
{
    if (!$env->isDebug()) {
        return;
    }

    ob_start();

    if (!$vars) {
        $vars = [];
        foreach ($context as $key => $value) {
            if (!$value instanceof Template && !$value instanceof TemplateWrapper) {
                $vars[$key] = $value;
            }
        }

        var_dump($vars);
    } else {
        var_dump(...$vars);
    }

    return ob_get_clean();
}
}