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

namespace Illuminate\Support;

use ReflectionClass;
use ReflectionMethod;
use ReflectionNamedType;
use ReflectionUnionType;

class Reflector
{
    /**
     * This is a PHP 7.4 compatible implementation of is_callable.
     *
     * @param  mixed  $var
     * @param  bool  $syntaxOnly
     * @return bool
     */
    public static function isCallable($var, $syntaxOnly = false)
    {
        if (! is_array($var)) {
            return is_callable($var, $syntaxOnly);
        }

        if ((! isset($var[0]) || ! isset($var[1])) ||
            ! is_string($var[1] ?? null)) {
            return false;
        }

        if ($syntaxOnly &amp;&amp;
            (is_string($var[0]) || is_object($var[0])) &amp;&amp;
            is_string($var[1])) {
            return true;
        }

        $class = is_object($var[0]) ? get_class($var[0]) : $var[0];

        $method = $var[1];

        if (! class_exists($class)) {
            return false;
        }

        if (method_exists($class, $method)) {
            return (new ReflectionMethod($class, $method))-&gt;isPublic();
        }

        if (is_object($var[0]) &amp;&amp; method_exists($class, '__call')) {
            return (new ReflectionMethod($class, '__call'))-&gt;isPublic();
        }

        if (! is_object($var[0]) &amp;&amp; method_exists($class, '__callStatic')) {
            return (new ReflectionMethod($class, '__callStatic'))-&gt;isPublic();
        }

        return false;
    }

    /**
     * Get the class name of the given parameter's type, if possible.
     *
     * @param  \ReflectionParameter  $parameter
     * @return string|null
     */
    public static function getParameterClassName($parameter)
    {
        $type = $parameter-&gt;getType();

        if (! $type instanceof ReflectionNamedType || $type-&gt;isBuiltin()) {
            return;
        }

        return static::getTypeName($parameter, $type);
    }

    /**
     * Get the class names of the given parameter's type, including union types.
     *
     * @param  \ReflectionParameter  $parameter
     * @return array
     */
    public static function getParameterClassNames($parameter)
    {
        $type = $parameter-&gt;getType();

        if (! $type instanceof ReflectionUnionType) {
            return array_filter([static::getParameterClassName($parameter)]);
        }

        $unionTypes = [];

        foreach ($type-&gt;getTypes() as $listedType) {
            if (! $listedType instanceof ReflectionNamedType || $listedType-&gt;isBuiltin()) {
                continue;
            }

            $unionTypes[] = static::getTypeName($parameter, $listedType);
        }

        return array_filter($unionTypes);
    }

    /**
     * Get the given type's class name.
     *
     * @param  \ReflectionParameter  $parameter
     * @param  \ReflectionNamedType  $type
     * @return string
     */
    protected static function getTypeName($parameter, $type)
    {
        $name = $type-&gt;getName();

        if (! is_null($class = $parameter-&gt;getDeclaringClass())) {
            if ($name === 'self') {
                return $class-&gt;getName();
            }

            if ($name === 'parent' &amp;&amp; $parent = $class-&gt;getParentClass()) {
                return $parent-&gt;getName();
            }
        }

        return $name;
    }

    /**
     * Determine if the parameter's type is a subclass of the given type.
     *
     * @param  \ReflectionParameter  $parameter
     * @param  string  $className
     * @return bool
     */
    public static function isParameterSubclassOf($parameter, $className)
    {
        $paramClassName = static::getParameterClassName($parameter);

        return $paramClassName
            &amp;&amp; (class_exists($paramClassName) || interface_exists($paramClassName))
            &amp;&amp; (new ReflectionClass($paramClassName))-&gt;isSubclassOf($className);
    }
}
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