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

namespace Illuminate\Database\Eloquent\Concerns;

use Illuminate\Support\Str;

trait GuardsAttributes
{
    /**
     * The attributes that are mass assignable.
     *
     * @var string[]
     */
    protected $fillable = [];

    /**
     * The attributes that aren't mass assignable.
     *
     * @var string[]|bool
     */
    protected $guarded = ['*'];

    /**
     * Indicates if all mass assignment is enabled.
     *
     * @var bool
     */
    protected static $unguarded = false;

    /**
     * The actual columns that exist on the database and can be guarded.
     *
     * @var array
     */
    protected static $guardableColumns = [];

    /**
     * Get the fillable attributes for the model.
     *
     * @return array
     */
    public function getFillable()
    {
        return $this-&gt;fillable;
    }

    /**
     * Set the fillable attributes for the model.
     *
     * @param  array  $fillable
     * @return $this
     */
    public function fillable(array $fillable)
    {
        $this-&gt;fillable = $fillable;

        return $this;
    }

    /**
     * Merge new fillable attributes with existing fillable attributes on the model.
     *
     * @param  array  $fillable
     * @return $this
     */
    public function mergeFillable(array $fillable)
    {
        $this-&gt;fillable = array_merge($this-&gt;fillable, $fillable);

        return $this;
    }

    /**
     * Get the guarded attributes for the model.
     *
     * @return array
     */
    public function getGuarded()
    {
        return $this-&gt;guarded === false
                    ? []
                    : $this-&gt;guarded;
    }

    /**
     * Set the guarded attributes for the model.
     *
     * @param  array  $guarded
     * @return $this
     */
    public function guard(array $guarded)
    {
        $this-&gt;guarded = $guarded;

        return $this;
    }

    /**
     * Merge new guarded attributes with existing guarded attributes on the model.
     *
     * @param  array  $guarded
     * @return $this
     */
    public function mergeGuarded(array $guarded)
    {
        $this-&gt;guarded = array_merge($this-&gt;guarded, $guarded);

        return $this;
    }

    /**
     * Disable all mass assignable restrictions.
     *
     * @param  bool  $state
     * @return void
     */
    public static function unguard($state = true)
    {
        static::$unguarded = $state;
    }

    /**
     * Enable the mass assignment restrictions.
     *
     * @return void
     */
    public static function reguard()
    {
        static::$unguarded = false;
    }

    /**
     * Determine if the current state is &quot;unguarded&quot;.
     *
     * @return bool
     */
    public static function isUnguarded()
    {
        return static::$unguarded;
    }

    /**
     * Run the given callable while being unguarded.
     *
     * @param  callable  $callback
     * @return mixed
     */
    public static function unguarded(callable $callback)
    {
        if (static::$unguarded) {
            return $callback();
        }

        static::unguard();

        try {
            return $callback();
        } finally {
            static::reguard();
        }
    }

    /**
     * Determine if the given attribute may be mass assigned.
     *
     * @param  string  $key
     * @return bool
     */
    public function isFillable($key)
    {
        if (static::$unguarded) {
            return true;
        }

        // If the key is in the &quot;fillable&quot; array, we can of course assume that it's
        // a fillable attribute. Otherwise, we will check the guarded array when
        // we need to determine if the attribute is black-listed on the model.
        if (in_array($key, $this-&gt;getFillable())) {
            return true;
        }

        // If the attribute is explicitly listed in the &quot;guarded&quot; array then we can
        // return false immediately. This means this attribute is definitely not
        // fillable and there is no point in going any further in this method.
        if ($this-&gt;isGuarded($key)) {
            return false;
        }

        return empty($this-&gt;getFillable()) &amp;&amp;
            strpos($key, '.') === false &amp;&amp;
            ! Str::startsWith($key, '_');
    }

    /**
     * Determine if the given key is guarded.
     *
     * @param  string  $key
     * @return bool
     */
    public function isGuarded($key)
    {
        if (empty($this-&gt;getGuarded())) {
            return false;
        }

        return $this-&gt;getGuarded() == ['*'] ||
               ! empty(preg_grep('/^'.preg_quote($key).'$/i', $this-&gt;getGuarded())) ||
               ! $this-&gt;isGuardableColumn($key);
    }

    /**
     * Determine if the given column is a valid, guardable column.
     *
     * @param  string  $key
     * @return bool
     */
    protected function isGuardableColumn($key)
    {
        if (! isset(static::$guardableColumns[get_class($this)])) {
            $columns = $this-&gt;getConnection()
                        -&gt;getSchemaBuilder()
                        -&gt;getColumnListing($this-&gt;getTable());

            if (empty($columns)) {
                return true;
            }
            static::$guardableColumns[get_class($this)] = $columns;
        }

        return in_array($key, static::$guardableColumns[get_class($this)]);
    }

    /**
     * Determine if the model is totally guarded.
     *
     * @return bool
     */
    public function totallyGuarded()
    {
        return count($this-&gt;getFillable()) === 0 &amp;&amp; $this-&gt;getGuarded() == ['*'];
    }

    /**
     * Get the fillable attributes of a given array.
     *
     * @param  array  $attributes
     * @return array
     */
    protected function fillableFromArray(array $attributes)
    {
        if (count($this-&gt;getFillable()) &gt; 0 &amp;&amp; ! static::$unguarded) {
            return array_intersect_key($attributes, array_flip($this-&gt;getFillable()));
        }

        return $attributes;
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>