aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/ramsey/collection/src/Tool/ValueToStringTrait.php
blob: 64fc5fa42c0ef428be0a44dc7ffde1c6c3e9b9ac (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
<?php

/**
 * This file is part of the ramsey/collection library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Collection\Tool;

use DateTimeInterface;

use function assert;
use function get_resource_type;
use function is_array;
use function is_bool;
use function is_callable;
use function is_object;
use function is_resource;
use function is_scalar;

/**
 * Provides functionality to express a value as string
 */
trait ValueToStringTrait
{
    /**
     * Returns a string representation of the value.
     *
     * - null value: `'NULL'`
     * - boolean: `'TRUE'`, `'FALSE'`
     * - array: `'Array'`
     * - scalar: converted-value
     * - resource: `'(type resource #number)'`
     * - object with `__toString()`: result of `__toString()`
     * - object DateTime: ISO 8601 date
     * - object: `'(className Object)'`
     * - anonymous function: same as object
     *
     * @param mixed $value the value to return as a string.
     */
    protected function toolValueToString(mixed $value): string
    {
        // null
        if ($value === null) {
            return 'NULL';
        }

        // boolean constants
        if (is_bool($value)) {
            return $value ? 'TRUE' : 'FALSE';
        }

        // array
        if (is_array($value)) {
            return 'Array';
        }

        // scalar types (integer, float, string)
        if (is_scalar($value)) {
            return (string) $value;
        }

        // resource
        if (is_resource($value)) {
            return '(' . get_resource_type($value) . ' resource #' . (int) $value . ')';
        }

        // From here, $value should be an object.
        assert(is_object($value));

        // __toString() is implemented
        if (is_callable([$value, '__toString'])) {
            return (string) $value->__toString();
        }

        // object of type \DateTime
        if ($value instanceof DateTimeInterface) {
            return $value->format('c');
        }

        // unknown type
        return '(' . $value::class . ' Object)';
    }
}