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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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/**
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 * This file is part of the ramsey/collection library
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 *
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 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
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 * @license http://opensource.org/licenses/MIT MIT
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 */
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declare(strict_types=1);
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namespace Ramsey\Collection\Tool;
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use DateTimeInterface;
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use function assert;
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use function get_resource_type;
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use function is_array;
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use function is_bool;
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use function is_callable;
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use function is_object;
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use function is_resource;
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use function is_scalar;
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/**
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 * Provides functionality to express a value as string
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 */
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trait ValueToStringTrait
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{
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    /**
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     * Returns a string representation of the value.
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     *
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     * - null value: `'NULL'`
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     * - boolean: `'TRUE'`, `'FALSE'`
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     * - array: `'Array'`
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     * - scalar: converted-value
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     * - resource: `'(type resource #number)'`
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     * - object with `__toString()`: result of `__toString()`
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     * - object DateTime: ISO 8601 date
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     * - object: `'(className Object)'`
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     * - anonymous function: same as object
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     *
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     * @param mixed $value the value to return as a string.
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     */
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    protected function toolValueToString(mixed $value): string
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    {
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        // null
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        if ($value === null) {
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            return 'NULL';
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        }
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        // boolean constants
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        if (is_bool($value)) {
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            return $value ? 'TRUE' : 'FALSE';
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        }
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        // array
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        if (is_array($value)) {
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            return 'Array';
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        }
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        // scalar types (integer, float, string)
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        if (is_scalar($value)) {
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            return (string) $value;
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        }
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        // resource
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        if (is_resource($value)) {
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            return '(' . get_resource_type($value) . ' resource #' . (int) $value . ')';
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        }
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        // From here, $value should be an object.
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        assert(is_object($value));
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        // __toString() is implemented
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        if (is_callable([$value, '__toString'])) {
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            return (string) $value->__toString();
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        }
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        // object of type \DateTime
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        if ($value instanceof DateTimeInterface) {
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            return $value->format('c');
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        }
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        // unknown type
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        return '(' . $value::class . ' Object)';
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    }
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}