The 
                                                                data_fill function sets a missing value within a nested array or object using "dot" notation:<?php $data = ['products' => ['desk' => ['price' => 100]]];
data_fill($data, 'products.desk.price', 200);
data_fill($data, 'products.desk.discount', 10);<?php     {
        $data = ['foo' => 'bar'];
        $this->assertEquals(['foo' => 'bar', 'baz' => 'boom'], data_fill($data, 'baz', 'boom'));
        $this->assertEquals(['foo' => 'bar', 'baz' => 'boom'], data_fill($data, 'baz', 'noop'));
        $this->assertEquals(['foo' => [], 'baz' => 'boom'], data_fill($data, 'foo.*', 'noop'));
        $this->assertEquals(<?php         $data = ['foo' => 'bar'];
        $this->assertEquals(['foo' => 'bar', 'baz' => 'boom'], data_fill($data, 'baz', 'boom'));
        $this->assertEquals(['foo' => 'bar', 'baz' => 'boom'], data_fill($data, 'baz', 'noop'));
        $this->assertEquals(['foo' => [], 'baz' => 'boom'], data_fill($data, 'foo.*', 'noop'));
        $this->assertEquals(
            ['foo' => ['bar' => 'kaboom'], 'baz' => 'boom'],<?php         $this->assertEquals(['foo' => 'bar', 'baz' => 'boom'], data_fill($data, 'baz', 'boom'));
        $this->assertEquals(['foo' => 'bar', 'baz' => 'boom'], data_fill($data, 'baz', 'noop'));
        $this->assertEquals(['foo' => [], 'baz' => 'boom'], data_fill($data, 'foo.*', 'noop'));
        $this->assertEquals(
            ['foo' => ['bar' => 'kaboom'], 'baz' => 'boom'],
            data_fill($data, 'foo.bar', 'kaboom')<?php         $this->assertEquals(['foo' => [], 'baz' => 'boom'], data_fill($data, 'foo.*', 'noop'));
        $this->assertEquals(
            ['foo' => ['bar' => 'kaboom'], 'baz' => 'boom'],
            data_fill($data, 'foo.bar', 'kaboom')
        );
    }<?php         $this->assertEquals(
            ['foo' => []],
            data_fill($data, 'foo.*.bar', 'noop')
        );
        $this->assertEquals(<?php         $this->assertEquals(
            ['foo' => [], 'bar' => [['baz' => 'original'], []]],
            data_fill($data, 'bar', [['baz' => 'original'], []])
        );
        $this->assertEquals(<?php         $this->assertEquals(
            ['foo' => [], 'bar' => [['baz' => 'original'], ['baz' => 'boom']]],
            data_fill($data, 'bar.*.baz', 'boom')
        );
        $this->assertEquals(<?php         $this->assertEquals(
            ['foo' => [], 'bar' => [['baz' => 'original'], ['baz' => 'boom']]],
            data_fill($data, 'bar.*', 'noop')
        );
    }<?php             ],
        ];
        data_fill($data, 'posts.*.comments.*.name', 'Filled');
        $this->assertEquals([
            'posts' => [