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    <h3>Editing: DocCommand.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2023 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy\Command;

use Psy\Formatter\DocblockFormatter;
use Psy\Formatter\SignatureFormatter;
use Psy\Input\CodeArgument;
use Psy\Output\ShellOutput;
use Psy\Reflection\ReflectionConstant;
use Psy\Reflection\ReflectionLanguageConstruct;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * Read the documentation for an object, class, constant, method or property.
 */
class DocCommand extends ReflectingCommand
{
    const INHERIT_DOC_TAG = '{@inheritdoc}';

    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
            -&gt;setName('doc')
            -&gt;setAliases(['rtfm', 'man'])
            -&gt;setDefinition([
                new InputOption('all', 'a', InputOption::VALUE_NONE, 'Show documentation for superclasses as well as the current class.'),
                new CodeArgument('target', CodeArgument::REQUIRED, 'Function, class, instance, constant, method or property to document.'),
            ])
            -&gt;setDescription('Read the documentation for an object, class, constant, method or property.')
            -&gt;setHelp(
                &lt;&lt;&lt;HELP
Read the documentation for an object, class, constant, method or property.

It's awesome for well-documented code, not quite as awesome for poorly documented code.

e.g.
&lt;return&gt;&gt;&gt;&gt; doc preg_replace&lt;/return&gt;
&lt;return&gt;&gt;&gt;&gt; doc Psy\Shell&lt;/return&gt;
&lt;return&gt;&gt;&gt;&gt; doc Psy\Shell::debug&lt;/return&gt;
&lt;return&gt;&gt;&gt;&gt; \$s = new Psy\Shell&lt;/return&gt;
&lt;return&gt;&gt;&gt;&gt; doc \$s-&gt;run&lt;/return&gt;
HELP
            );
    }

    /**
     * {@inheritdoc}
     *
     * @return int 0 if everything went fine, or an exit code
     */
    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $value = $input-&gt;getArgument('target');
        if (ReflectionLanguageConstruct::isLanguageConstruct($value)) {
            $reflector = new ReflectionLanguageConstruct($value);
            $doc = $this-&gt;getManualDocById($value);
        } else {
            list($target, $reflector) = $this-&gt;getTargetAndReflector($value);
            $doc = $this-&gt;getManualDoc($reflector) ?: DocblockFormatter::format($reflector);
        }

        $db = $this-&gt;getApplication()-&gt;getManualDb();

        if ($output instanceof ShellOutput) {
            $output-&gt;startPaging();
        }

        // Maybe include the declaring class
        if ($reflector instanceof \ReflectionMethod || $reflector instanceof \ReflectionProperty) {
            $output-&gt;writeln(SignatureFormatter::format($reflector-&gt;getDeclaringClass()));
        }

        $output-&gt;writeln(SignatureFormatter::format($reflector));
        $output-&gt;writeln('');

        if (empty($doc) &amp;&amp; !$db) {
            $output-&gt;writeln('&lt;warning&gt;PHP manual not found&lt;/warning&gt;');
            $output-&gt;writeln('    To document core PHP functionality, download the PHP reference manual:');
            $output-&gt;writeln('    https://github.com/bobthecow/psysh/wiki/PHP-manual');
        } else {
            $output-&gt;writeln($doc);
        }

        // Implicit --all if the original docblock has an {@inheritdoc} tag.
        if ($input-&gt;getOption('all') || \stripos($doc, self::INHERIT_DOC_TAG) !== false) {
            $parent = $reflector;
            foreach ($this-&gt;getParentReflectors($reflector) as $parent) {
                $output-&gt;writeln('');
                $output-&gt;writeln('---');
                $output-&gt;writeln('');

                // Maybe include the declaring class
                if ($parent instanceof \ReflectionMethod || $parent instanceof \ReflectionProperty) {
                    $output-&gt;writeln(SignatureFormatter::format($parent-&gt;getDeclaringClass()));
                }

                $output-&gt;writeln(SignatureFormatter::format($parent));
                $output-&gt;writeln('');

                if ($doc = $this-&gt;getManualDoc($parent) ?: DocblockFormatter::format($parent)) {
                    $output-&gt;writeln($doc);
                }
            }
        }

        if ($output instanceof ShellOutput) {
            $output-&gt;stopPaging();
        }

        // Set some magic local variables
        $this-&gt;setCommandScopeVariables($reflector);

        return 0;
    }

    private function getManualDoc($reflector)
    {
        switch (\get_class($reflector)) {
            case \ReflectionClass::class:
            case \ReflectionObject::class:
            case \ReflectionFunction::class:
                $id = $reflector-&gt;name;
                break;

            case \ReflectionMethod::class:
                $id = $reflector-&gt;class.'::'.$reflector-&gt;name;
                break;

            case \ReflectionProperty::class:
                $id = $reflector-&gt;class.'::$'.$reflector-&gt;name;
                break;

            case \ReflectionClassConstant::class:
                // @todo this is going to collide with ReflectionMethod ids
                // someday... start running the query by id + type if the DB
                // supports it.
                $id = $reflector-&gt;class.'::'.$reflector-&gt;name;
                break;

            case ReflectionConstant::class:
                $id = $reflector-&gt;name;
                break;

            default:
                return false;
        }

        return $this-&gt;getManualDocById($id);
    }

    /**
     * Get all all parent Reflectors for a given Reflector.
     *
     * For example, passing a Class, Object or TraitReflector will yield all
     * traits and parent classes. Passing a Method or PropertyReflector will
     * yield Reflectors for the same-named method or property on all traits and
     * parent classes.
     *
     * @return \Generator a whole bunch of \Reflector instances
     */
    private function getParentReflectors($reflector): \Generator
    {
        $seenClasses = [];

        switch (\get_class($reflector)) {
            case \ReflectionClass::class:
            case \ReflectionObject::class:
                foreach ($reflector-&gt;getTraits() as $trait) {
                    if (!\in_array($trait-&gt;getName(), $seenClasses)) {
                        $seenClasses[] = $trait-&gt;getName();
                        yield $trait;
                    }
                }

                foreach ($reflector-&gt;getInterfaces() as $interface) {
                    if (!\in_array($interface-&gt;getName(), $seenClasses)) {
                        $seenClasses[] = $interface-&gt;getName();
                        yield $interface;
                    }
                }

                while ($reflector = $reflector-&gt;getParentClass()) {
                    yield $reflector;

                    foreach ($reflector-&gt;getTraits() as $trait) {
                        if (!\in_array($trait-&gt;getName(), $seenClasses)) {
                            $seenClasses[] = $trait-&gt;getName();
                            yield $trait;
                        }
                    }

                    foreach ($reflector-&gt;getInterfaces() as $interface) {
                        if (!\in_array($interface-&gt;getName(), $seenClasses)) {
                            $seenClasses[] = $interface-&gt;getName();
                            yield $interface;
                        }
                    }
                }

                return;

            case \ReflectionMethod::class:
                foreach ($this-&gt;getParentReflectors($reflector-&gt;getDeclaringClass()) as $parent) {
                    if ($parent-&gt;hasMethod($reflector-&gt;getName())) {
                        $parentMethod = $parent-&gt;getMethod($reflector-&gt;getName());
                        if (!\in_array($parentMethod-&gt;getDeclaringClass()-&gt;getName(), $seenClasses)) {
                            $seenClasses[] = $parentMethod-&gt;getDeclaringClass()-&gt;getName();
                            yield $parentMethod;
                        }
                    }
                }

                return;

            case \ReflectionProperty::class:
                foreach ($this-&gt;getParentReflectors($reflector-&gt;getDeclaringClass()) as $parent) {
                    if ($parent-&gt;hasProperty($reflector-&gt;getName())) {
                        $parentProperty = $parent-&gt;getProperty($reflector-&gt;getName());
                        if (!\in_array($parentProperty-&gt;getDeclaringClass()-&gt;getName(), $seenClasses)) {
                            $seenClasses[] = $parentProperty-&gt;getDeclaringClass()-&gt;getName();
                            yield $parentProperty;
                        }
                    }
                }
                break;
        }
    }

    private function getManualDocById($id)
    {
        if ($db = $this-&gt;getApplication()-&gt;getManualDb()) {
            $result = $db-&gt;query(\sprintf('SELECT doc FROM php_manual WHERE id = %s', $db-&gt;quote($id)));
            if ($result !== false) {
                return $result-&gt;fetchColumn(0);
            }
        }
    }
}
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